Originally Posted by Husky
This reply has left me shaking my head. If it works inside the car (as mine does), then why would you insist on routing the antenna outside the car? Your assumption that inside car placements are universally bad fails in my experience; I even get reception inside my garage (with no terrestrial repeater signal). The simple point here is that an indoor antenna mount "may" work for many; I'm sorry it didn't work for you.
I can assure you, if you are getting signal in your garage (especially with SIRIUS) it is a terrestrial repeater. XM will get indoor reception with a home antenna because they are more directional but a car antenna on your dash in your garage?
Go XM for having a great satellite signal I guess, but it still stands that if it's IN your car and not ON your car, you are losing a very large section of coverage to your metal roof...
Keep in mind XM's repeaters are very expansive, almost 900 of them. A map of them is available on my website at http://www.whatsonmyxm.com/gmaps/repeaters.php
Finally, it didn't not work out for me. I have an Accord with XM/Navi--it's built in.