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Okay, did a bit more hunting. I didn't see any real issues with ground wiring. Everything looks to be stock wiring set up. However, with running lights on and the dash dimmer down to off, no buzzing from vhf. But if I increase the dimmer the buzz comes back with changing frequency as the dimmer increases the dash light. So it must be something to do with the dimmer switch or lights on bezel.
Additional ideas?
Mark
Did you find a solution? I have the exact same thing happening but with my stereo. It only buzzes when I turn the nav lights on but if I dim the dash lights down the buzz goes away. Have you been able t o find a replacement for the dimmer switch?