Unless you have an high gain 800 MHz antenna, or an external up high you won't have much luck getting the IDPS S1, S2 from Greenfield.
I run high gain 800 MHz antennas, the RS 800 MHz BNC duckie which is crazy good, and an 800 MHz SMA one which is very good but not as wow as the GRE manufactured RS one. I use an SMA to BNC adaptor to run the RS one on my BCD396XT for when I want maximum pull in on signals.
Using those, I can get the IDPS S1/2 as far away as Arcadia, and nearly to Martinsville.