Here's some more updates, decided to buy this
Buy the Terk Roof-Mount XM Antenna and other Satellite radio antennas & extensions at circuitcity.com . I thought Honda's tuner would use the standard XM connector, after going back and forth between circuit city/best buy to find a compatible adapter, none of them would fit as the Honda tuner uses a proprietary connector. I even tore apart the conector to try to get it to fit. Resigned I decided to use these
http://http://www.xm411.com/phpbb/viewtopic.php?t=4092 instructions and spliced in the new antenna with Honda's connector. Now it works awesome! No more drop outs even in the Cajon pass on the way to Las Vegas.