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""You bring up a good point though about altitude: If SIRI and XMSR use geosynchronous orbits and SIRI's orbit is elliptical, its apogee must be higher than XMSR's sats. This can be seen in the previous link: SIRI's apogee is about 47,000 km, vs XMSR's 36,000 km. I'm sure this extra distance doesn't help SIRI, but I really don't know enough to say by how much.
Electromagnetic signals lose power in proportion to 1/(distance squared). So you can see the received signal has very low power for both in general. ""

Wow, you people are smart. I understood about five words of those paragraphs (and those were the conjunctions and verbs). Whether an ounce of this is true... I have no idea (way beyond my scope), but it sounds really impressive nonetheless!

Yours in geophysics (right),
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