I posted about this in the Space forum, but it occurs to me that some here may find it interesting or useful (or wrong and useless).
I've found a number of excellent web references to UHF military satellite downlinks in the 225-318 MHz subband, but for some reason the majority of them seem to be focused on signals that can be received in Europe. So I'm cataloging the various downlinks receivable from the East and West coasts, which together should constitute a reasonably complete guide to the geostationary downlinks that cover the continental US, Canada, and Mexico.
I'm pretty well done with the East coast survey (from the Philly area), and will add a survey from West coast (SF Bay area) survey later this month.
The catalog is here: UHF Satellite Downlinks Receivable in the US
A brief guide to the spectrum produced by various transponders is here: Some Example UHF Satellite Downlink Spectrum Plots
A thread in the space forum is here, which is probably the best place for comments and corrections (which are most welcome): http://forums.radioreference.com/spa...ivable-us.html