vhf air

Of course I can hear air on my scanners, but if I wanted to spend some money for fun, would getting a 3.5 to male BNC from my Tecsun PL 660 to my discone help pick up air better?

I am looking to resolve an issue when transmitting on a VHF FM radio causing back feeding and breaking the squelch on a VHF AM radio. I would like to know if anyone else has dealt with a similar problem and what their solution(s) they found. Do I need a BandPass Filter/Isolator on the VHF AM...