I have the 330 and mounted it between the two front seats (on the counsel)
The only issue I have is that it will take a awhile to get a signal at start up. Driving seems fine and i don't lose the signal (well a few times).
I am thinking of getting the GA 27C low profile remote automobile antenna. The lowest I have seen is $60.00. I would place this on the windshield and run it back to the unit.
Question: Do you think it will help?
Thanks
low profile antenna
External antennas work great. I ordered a CF GPS for my computer and it came with a remote automobile antenna that sticks to your roof with a magnet,(cost about $40.00) Put this on my Street Pilot C340 and now I get a strong signal with fast satellite locks no matter whare the GPS is in my Car.