Comments or suggestions for re-radiating antennas? I'm thinking of getting one to simultaneously boost the signal to my headliner-mounted Escort 9500i and dash-mounted Garmin 680. I have an external antenna that attaches directly to the 680. Works well, but a pain to connect each time. I was thinking, of tucking the re-radiating transmitting antenna in the headliner and hoping the signal is strong enough to help my 9500i and Garmin 680.