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Originally Posted by dstankov
I would be interested in knowing how the antenna works when you are travelling due North. I believe that is when you may start to experience some intermittent signal strength issues.
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Sirius(my employer) only recently added a geostationary satellite. There is also a set of three low-earth-orbit satellites providing signal (at any given time two of which are "visible" over the US).
Here is a good animation that shows the Sirius satellites orbits:
Thus even if the antenna is on the dash in an Axis/Vegas and the driver is driving due north satellites will still be visible.
Also note that the other structure besides the front cap is just standard aluminum framed fiberglass/wood which would allow signal through as well.
XM has always used geostationary satellites and it wasn't until after the merger did Sirius launch one as well.