I'm going to fudge up the numbers because my memory sucks but when I did the FridgeFTA testing and report I looked at the noise floor and cutoff on the regular C1 using a spectrum analyzer. Very nice and steep cut right around 3600MHz, very impressed. What I don't think was in my report was that during informal testing (playing around at night) I hit 40.5W circular, without the dielectric plate in the C1 and on a 1 meter dish. I detected a TP around 3600 MHz and matched it to lyngsat to verify. This was well below the advertised range of the normal C1. If my STB could see a C-band circular TP on a 1 meter below range on a BUD it should work awesome below range. I'd definitely run the normal C1 here in North America plus you have less to worry about interference wise since you aren't dipping as close to wimax or whatever it is around 3GHz that causes issues in foreign countries.