Originally Posted by Batmanatthenewb
The XM antenna will NOT work.
XM is a totally different type of signal from standard FM radio.
Also, XM antennas are NOT a passive. The XM receiver sends a small amount of power up the wire to the amplifier/converter in the antenna. Without being powered correctly the antenna will not work.
XM is in the 2.6Ghz freq. range, the antenna is designed and tuned for this frequency range. It will not pickup a signal at 88-107Mhz.
And shortening or adding to the cable could cause it to no longer work with a XM receiver. This is espcially true when adding to the cable. This is why XM antenna extension cables have a built in powered amplifier.