I routed my XM/Sirius antenna thru a front grille on my dash (GMC SUV) right up against the windshield. It's not quite as good as my old OEM SUV setup - it drops out in a few small places that the OEM did not. But those drops are brief & minor, not a big deal, I like it a lot better than mounting it outside the vehicle.
xm or sirius? it makes a big difference. an xm radio antenna, you can mount it inside with great results. sirius is different. i have mine under my cowl, and like yours it cuts out from time to time.
it also depends on where you are. some areas have repeaters. like the long tunnel under the runway at lax, i can almost go the entire length without it cutting out. where as other places, just under a fwy overpass it cuts out.
You're not going to be able to combine the two, however, the gps antenna can be hidden inside the car. Mine is under the gauge cluster hood.I've got an existing extrnal antenna mount for the factory Sat radio. I haven't dug into it yet, but I may be able to reuse the cover and wire routing.
XM is very different in how the satellite "sees" the signal. the way it had been described to me is, XM looks over the horizon, and Sirius looks straight down.You're not going to be able to combine the two, however, the gps antenna can be hidden inside the car. Mine is under the gauge cluster hood.
When I had a Hummer H3 it came with factory XM. I installed my aftermarket alpine headunit and aftermarket xm receiver, but I used the factory xm antenna that was already on the truck. All I had to do was trim some plastic from the connector since it was different.
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I do and it is Sirius but the sat module for this car is in the trunk. The new install will be up at the dash. I am hoping that I can use the existing shark fin antenna on the roof to mount the new antenna. Maybe be able to pop out the old antenna and stick mine in? I really wont know until I get the headliner down. Hope that happens this weekend.He said he has an existing sat radio antenna. If it is Sirius he may be able to use it. That was the point I was trying to make.