Can do a few things with wireless remote speaker/s and of course blue tooth/FM transmitters and the like BUT, that wasn't your question, soooooo......
Does your stereo deck have a "aux" input plug? Does the VHF have a "external speaker" audio out plug? If so, ya can just go to RS and get the right size (probably 3.5mm patch cord, jacks on both sides) that'll go between the two. Plug the patch cord in both and select the aux in on the deck.
If you haven't an "aux in" like I had with my old deck (8 track), and have too much time/parts,
this might contain some info that might help.
I use mine like, hmmmmmm NEVER!! But, it works nice and if I need to blast the VHF over my speakers, it works quite nice.
J/K about the 8-track

It's a cassette!!.......lol