Sirius Satellite Radio SIRIUS InV2 User Manual page 58

2. Greater confusion may arise with whip type antennas. Figure 37 shows some whip
type antennas which can be found on the front or rear of a vehicle's roof, or on the
rear windshield. Some of these antennas could be the FM antenna and some are
not the FM antenna.
3. Antennas with a short 2-4 inch stubby whip or protrusion are not FM antennas, while
antennas with a whip length of 7 inches or longer are likely to be the FM antenna. If
your vehicle has a short stubby antenna, you should continue searching your vehicle's
FM antenna.
If after searching your vehicle you're still uncertain as to where its FM antenna is located
then SIRIUS recommends professional installation of the FM Extender Antenna. Ask
your SIRIUS retailer if they provide professional installation services, or can recommend
a professional installer.
If you don't correctly identify your vehicle's FM antenna, the installation of the FEA will
result in poor performance and unsatisfactory results.
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Figure 37