Neal Howard
Cleared for Takeoff
Somewhere out there on the interwebs, there are plans for making a dirt cheap ground plane antenna for scanners to receive the VHF aviation band. I think Jim Weir published the article.
Spike, most vehicle glass has metal in or on it these days. Thru the glass antennas won't work with most of the tint types out there.
If your handheld uses BNC, just pick one of these and stick it inside (suction cup version) up high, or outside the window, the RG-174 is tiny and can handle the abuse of being closed in a window or snaked between the foam on the door and the door frame, and you can take it off when not in use.
http://www.scannermaster.com/Portable_Mounting_Gear_for_Police_Scanner_Radios_s/32.htm
They probably make a similar one for SMA connectors if you have that variety.
For just talking to ground when on the airport, the duckie on the handheld should work fine.
Technically the aircraft has a license to transmit by nature o being an aeronautical station, and your car doesn't, by the way, if you feel like looking into the legalities. Your vehicle is not offered a free pass to not have a station license like the Bo does within the lower 48.