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Being fed up with having no GPS reception inside the car, I have bought a GPS repeater that has an external antenna and retransmits the GPS signal inside the car.

http://www.gpszone.ca/accessories/antennas/wide-gps.php

Instead of using the supplied (active) antenna, I'd quite like to use the OEM one going to my RNS-D via a splitter.

Could this work? Even if my repeater is trying to power an antenna? Is the RNS-D trying to power the OEM antenna on the roof?

CheeRS

P.S. Also, where can I get 12v supply from inside the glovebox that'll go off with the ignition? Thanks!

I used a GPS splitter to supply GPS Information to an origin B2 speed camera detector. Seemed to work great, I think the splitter blocks the power from the second feeding device. So the RNS-E in my case powered the GPS roof antenna.