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Originally Posted by trackbait  On the C5 coupe, there is an antenna combiner under the plastic trim of the "B" pillar or hoop where the AM (in the back window) and the FM (on the front glass "combine" and one coax feeds both signals to a single cable that connects on the rear of the receiver.. |
I believe the STS is as I describe. I am willing to be found wrong but your description of the C5 fits my contention rather than disputes it. 'Combining' antenna's as you describe means that all such antennas so combined each contibute signal to all bands of the radio. To avoid that would require RF filters and a splitter/joiner that costs 3dB per source.
Digital communications like Satellite may not be the same but analog stuff is pretty simple.