No. At best, the 2 meter element will be an endfire longwire at GPS
frequencies.

I don't know the reason you wish to run both on the same antenna, but I
also needed the same antennas on my car. I have a Garmin III Plus as
the input to APRS in the car. I use a suction cup mounted external
antenna for the Garmin GPS which is about (from memory) 2.5 inches wide,
1.5 inches deep, and .4 inches thick. It works very well mounted to the
lower center of the windshield on my Jetta. I run through a duplexer
into a trunk mounted Comet UHV for the 2m APRS antenna.

tom
K0TAR

Andrew wrote:

I've got a 2 meter antenna for my mobile unit, and I'm wondering if it
could double as a GPS antenna. I've got a friend, who 5 years ago
showed me how he had his laptop running MS Streets & Trips hooked to a
GPS receiver. I'm not sure if he had a standalone receiver meant for
laptop use, or somehow used his ham antenna and another receiver. Any
ideas?

Thanks,
Andrew Weber
KG4OTT