You bring up an interesting point, Edmund. In the (very) old days of DirecTV I had a Sony SAT-A4 receiver that would work with RF. It's problem was that if your neighbor had one you could both be controlling each other's receivers. It (RF) proved to be worthless because in fact my neighbor had the same receiver.

So is RF control of the HR20 and H20 linked to one specific receiver and incapable of even accidentally controlling another receiver nearby? How (in simple terms) are they doing that? My curious mind wants to know.

Thanks