| Answer: | Many of the older XM Radio systems and tuners had 2 wire antenna systems. (Yellow/Green) One wire was for reception of satellite based transmissions and the other was for reception of ground-based (terrestrial) transmissions.
Newer XM receivers ave a single antenna wire (purple)
, which integrates both the satellite and terrestrial signals into one wire.
The two technologies are not compatible with one another, so if you have a 2 wire antenna input, you will need to purchase a 2 wire antenna. The new generation of slim antennas now use a 1 wire configuration.
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