Is my 8' VHF antenna a Lightning Rod

JohnnyRuuDe

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Nov 3, 2008
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I have an end-fed 8' VHF antenna on my 15 motorboat. The manual says, "No internal or external ground is required." What about lightning? Am I safe without it grounded in some fashion? Thanks -Lewis
 

Expidia

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Re: Is my 8' VHF antenna a Lightning Rod

As soon as I see or hear lightning in the area . . . I'll try to out run the oncoming storm or head back to the dock.

I mounted my 8 footer on a bracket so I can immediately lower it flat on my 15 foot aluminum. It still works, just not much for range.

I lower it for trailering anyway, but I drop it right down if lightning is around.

Why take a chance on becoming a statistic?

DSC03962.jpg
 

dingbat

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Re: Is my 8' VHF antenna a Lightning Rod

A lightening strike is of such intensity that it wouldn't make a bit of difference if the antenna was grounded or not.

I?ve never had a problem with the VHF antenna but I?ve had fishing rods start rattling in the holders more than a few times.

Pretty helpless feeling. Nothing to outrun at that point.
 

JohnnyRuuDe

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Re: Is my 8' VHF antenna a Lightning Rod

Thanks for the wisdom. I'll just pray for blue skies then...
 

Splat

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Re: Is my 8' VHF antenna a Lightning Rod

I have an end-fed 8' VHF antenna on my 15 motorboat. The manual says, "No internal or external ground is required." What about lightning? Am I safe without it grounded in some fashion? Thanks -Lewis

The ground issue they are talking about is in regards to how the antenna acts with signal transmission. Some antennas require a ground plane to propery create the signal plane and transmit effectivly. Some are designed like your to not require this ground plane.

BIll
 

waterinthefuel

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Re: Is my 8' VHF antenna a Lightning Rod

Yes, that's right. They are talking about in reference to transmissions, not lightening. Why would you be out in a storm of that magnitude in a 15' boat anyway? I have a 13'6" boat and wouldn't dream of being out in that in anything close to a storm like that. You can see for 50 miles in all directions, it's not like it would sneak up on you.

Get out of weather that bad. Retract the antenna and run like hell.
 

tashasdaddy

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Re: Is my 8' VHF antenna a Lightning Rod

especially in FL it is possible to get caught, the storms can move so fast.

got caught in a 27 ft Sailboat, blinding rain and lighting, had to sit and wait for it to quit, because the Bridge tender, would not open the draw bridge until the lighting quit. about 6 boats waiting to get thru. our marina was just on the other side.
 

Expidia

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Re: Is my 8' VHF antenna a Lightning Rod

especially in FL it is possible to get caught, the storms can move so fast.

got caught in a 27 ft Sailboat, blinding rain and lighting, had to sit and wait for it to quit, because the Bridge tender, would not open the draw bridge until the lighting quit. about 6 boats waiting to get thru. our marina was just on the other side.

Ouch . . . I could see that happening being stuck on a sail boat and the bridge being closed.

Ya, in Fl those lightning storms come out of no where fast.

My Wife and I got stuck on my BIL's boat a few years back as lightning was seen off in the distance when we were off the coast of Fort Lauderdale. We bee lined for a canal to get off open ocean trying to outrun the storm. But it had Manatees in it and we could not go over 5 mph. It tooks us 30 minutes to reach the safety of a restaurant in the canal but all the while lightning was crashing in bolts all around us through the length of the canal.

To my Floridian BIL, this was just another day of boating . . . yikes!

Even up North where I am most lakes are surrounded by mountains so even on a perfectly clear day you can't see the storms until they are almost over you. I wish I had a 50 mile view.

So I rely on the CG weather alert break ins and can hear their alerts over the 8 foot antenna. My VHF handheld with it's 2 mile range was pretty useless.

Because the CG antennas are so high up on the mountains, I sometimes pull in their off shore weather alerts that they are broadcasting for the Long Island off shore boaters and the ocean is about 200 miles south of me when I'm on Northern Lake George for the day! They must relay those reports to their various CG locations.
 

Boatist

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Re: Is my 8' VHF antenna a Lightning Rod

We got caught out in a big lighting storm a few years back and it was scarry and no fun at all.
We checked the weather like always and checked the wave guage reports from the buoy 12 miles out. All was like a normal Summer day.
We headed out in the Pacific Ocean from Bodega Bay California. We went to a location about 20 miles North up the coast. Weather was Foggy with about 1/2 mile visibilty, Seas were light about 5 feet every 11 seconds.
When we arrived at our waypoint fog had raised up and could see about 2 miles. We started fishing and the fog clear and we had light winds about 15 knots. When the Fog cleared we could see way offshore a big lighting storm but to the south back to port still pretty foggy.
It was not long and we were in a big lighting storm. Only one I ever seen in more than 20 years of fishing the same area.
Both my antennas were making a frying noise and we could smell some ozone. No way to excape so we headed into shore as close as we could get to a high mountain with lots of trees. I had the wife and kids go up front in our close bow Aluminum boat. Antennas still making a loud frying noise with lighting strikes about every 30 seconds. Nothing we could do short of crashing the boat into shore with high clift and jagged rocks. Finally it started to rain so hard we could not see 50 feet. We decided to head back to port as the lighting let up. I touched the loran to set a route back to Bodega Bay and I got a big shock. It tried again making sure to touch only the plastic key pad. We headed back. When we got back the rain stopped long enough to wash the boat and engines but stated again before we got the covers put on.
Back in Camp we call our other son in Sacramento on the Ham radio and he informed us it was raining in Sacramento also. This was July and Sacramento normally gets no rain at all from May to October. He then told us the storm was a Hurricane that just missed Hawii then moved North to the 51 degree waters of the Pacific where we were. It was now a Tropical Depression.

Talking with boaters that were 30 miles South and some that were 27 miles west and all had the same conditions we Had.

One guy said the antenna frying noise was the boat bleading off charge and may have saved us from a lighting strike.

Thing I do not understand to this day is that there was no mention of the storm on the weather radio or the Coast Guard Marine information brodcast.

It continued to rain the entire night. Next morning the sun came out and it was a great day with no fog at all.

This a trip that none of us will ever forget. Tent leaked So I rigged a tarp over in the the wind and rain in the middle of the night. The tent staied up in the wind and rain.
 

JohnnyRuuDe

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Re: Is my 8' VHF antenna a Lightning Rod

Yes, that's right. They are talking about in reference to transmissions, not lightening. Why would you be out in a storm of that magnitude in a 15' boat anyway? I have a 13'6" boat and wouldn't dream of being out in that in anything close to a storm like that. You can see for 50 miles in all directions, it's not like it would sneak up on you.

Get out of weather that bad. Retract the antenna and run like hell.


I'm well aware that they are referring to transmissions, not lightning. My question was whether or not there was a way to ground to antenna against lightning in case of a strike. I'm not counting on getting hit but If do get hit...I want to know that I've safeguarded the vessel the best I could to ensure the safety of my passengers and myself.
I'm not sure which storm you speak of but, let's just say vermont lakes don't frequently produce "high seas". We can see maybe a couple of miles...We all live in different areas with different operating requirements (try to think outside the box)
 

Expidia

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Re: Is my 8' VHF antenna a Lightning Rod

I'm well aware that they are referring to transmissions, not lightning. My question was whether or not there was a way to ground to antenna against lightning in case of a strike. I'm not counting on getting hit but If do get hit...I want to know that I've safeguarded the vessel the best I could to ensure the safety of my passengers and myself.
I'm not sure which storm you speak of but, let's just say vermont lakes don't frequently produce "high seas". We can see maybe a couple of miles...We all live in different areas with different operating requirements (try to think outside the box)

I've had the same questions you had about lightning and small boats. I've already looked into grounding before I mounted mine. You can do a search for that thread or I might have posted it over on theHullTruth.com since that site is mostly salt water and bigger rigs. Do a search over there too.

Bottom line is many big boats can have special grounding systems where there is a plate mounted on the outside of the hull, below the water line to which the strike would be diverted through a wire. These systems protect the elaborate electronics on the bigger boats too.

Do a search on google to learn all about lightning.

But this line of yours . . . Quote: We all live in different areas with different operating requirements (try to think outside the box)[/QUOTE]

My answer to that is if you get hit by lightning try and think "inside the frying pan" :D

In my opinion that statement is somewhat rediculous. A lightning strike can happen ANYWERE. In a small boat all we can do is try and lower our odds of getting hit by listening to the weather alerts, watch the skies and run like hell when you see certain patterns of clouds forming (I'm not going to tell you which pattern, look it up).

Some people carry a simple portable AM radio where through the static when you move the dial off a station, you can here lightning coming your way from 50 miles off!

Last year on one of our local rivers (Mohawk River) a canal system that goes west the entire length of NY. Kids will swim around the lock systems jumping off the canal walls.

When it started to rain this particular day, these kids didn't know enough to get out of the rain so 1 kid was standing near a grill with it's pole in the ground, lightning struck the grill, traveled into the ground thru the pole and up thru the kids's "bare and wet" feet. He died instantly.

The canal in only a few hundred feet across yet he was only standing on it's banks. So lightning does not care what size body of water you are on.

How many golfers each yaer get toasted when lightning hits the metal club they are holding onto in the rain. Or they run under a tree for cover and the tree being the tallest structure gets whacked.

On Lake George, when I'm on the run from a lightning storm I still see Morons towing a skier heading in the other direction, right into the storm :eek:

I say most of these accidents are caused by parents never teaching their kids common sense (like don't swim in the rain or stand barefoot on wet grass in the rain).

At least take a boating CG course and you could ask these same questions about lightning to the instructor.

Just put the antenna down, drive like hell and try and reach a port. This is one reason I always now get the max hp outboard for my boat.

My next boat is (I'm keeping the Lund too) usually is sold with a 150, but can take a 200. First chance I get I'm swapping it out for the 200 just so I can outrun most storms and find a safe haven since this second boat will also be all aluminum.
 

dingbat

Supreme Mariner
Joined
Nov 20, 2001
Messages
16,313
Re: Is my 8' VHF antenna a Lightning Rod

I'm well aware that they are referring to transmissions, not lightning. My question was whether or not there was a way to ground to antenna against lightning in case of a strike. I'm not counting on getting hit but If do get hit...I want to know that I've safeguarded the vessel the best I could to ensure the safety of my passengers and myself.
I'm not sure which storm you speak of but, let's just say vermont lakes don't frequently produce "high seas". We can see maybe a couple of miles...We all live in different areas with different operating requirements (try to think outside the box)

http://www.boatus.com/seaworthy/swlightning.asp
 

mphy98

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Re: Is my 8' VHF antenna a Lightning Rod

If memory serves me correctly lightning can travel 10 miles for its point of origin. Back in 1972 I was motoring along hwy 90 off Biloxi, bright no clouds above us but a storm miles off shore, you could see it building in the distance. a Sheriff was directly behind me and the fact I was driving my vette and was a little happy from adult beverages had me a little concerned. All of a sudden, a bright flash came and i saw two guys on the beach, one went down like a rock, the other clearly dazed. For those of you who have been there in the past the curbs were very low, so I jumped the curb and got off the road, jumped out of my car sheriff behind me and both of us ran to these guys. The one was toast. You could have drawn a line straight down the middle of him charred on one side, OK on the other. Zipper blown out shoelaces blown off on one foot. It is a sight you never forget. We had to tackle the other guy, he had no idea what happened or where he was. I learned a very valuable lesson that day about lightning. Just because it is clear above you, if a storm is in a distance, beware.
 
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