Thought I would share my experience with air-band antennas.
After dealing with a "Ham" repeater (W8DZ) blasting away at a KCVG tower frequency, I finally ditched the broadband "scanner" antenna and finally made the transition to an ASP ground-plane antenna cut to 124MHz center frequency, bandwidth about 118MHz to 128MHz. It is so out-of-ham-band, the Ham radio is no longer a factor.
If you listen to the KCVG feed now, it is fairly pure and clean. Not so with a number of others. No buzzing ground-loops, no RF interference, no static on most transmissions. Judge it for yourself after a listen!
The ASP antenna was about $160, so not cheap, but works!