krj wrote in
:

Using an antenna on a dish would work for XM if you put the feed at the
correct focal point for C band (DirectTV and Dish are Ku band), but
would be a problem for Sirius because their three satellites are not
GEO. They are LEO in an eliptical orbit so you would need the latest
Keplers and a tracking antenna. Also they are at 2.3 Ghz.
krj


If Sirius' birds were LEO and they only had 3 of them, you'd only have
service in three 8 minute periods per 90 minute orbits, but only if those
changing orbits caused by the earth's rotation were to happen to have you
in their footprint. No, Sirius is Geosynchronous, too.

You are right about the 2.3G on the C-band dish, but there would be some
reflection. I'd bet the excellent TV hackers across the Caribbean at fixed
locations have some big dishes pointed to XM or Sirius birds to get enough
signal for a lock on exotic islands.