Richyrich,
I am uncertain of the precise motive for your query, so that is why I mentioned the issue of different receivers. I wasn't sure from your initial post that you were fully aware of it. However, I have pondered making similar polls myself, so I wasn't trying to shoot your project down, but only trying to help you refine it better.
If you were looking to map out the footprint over the country, you would be best served by investigating
SatBeams - Home as that would provide a great deal of very good information.
You may use the information from their site as a very good reference and baseline.
If you are looking to compare results obtained through the use of identical equipment in order to judge your alignment and equipment function, then your polling query is right in line (with a few details to be punctuated).
I guess it really all depends upon what you are searching for... Is it the comparison of the operation of the dish, the receiver, the LNBF or the beam strength vs geographic location. Or if you were trying to judge your whole system and the alignment of your personal setup.
I hope you understand that I was asking you to clarify what you were seeking so that we provide the best responses to you.
RADAR