Stan, I'll try some of the 22uh chokes in the power and ground. I see the receiver already has a cap across the power/ground, so the addition of the chokes may be a winner. FWIW, in order for this to work, I'd like the receiver to be plugged in to my board, so I do want it to work closer. I'm thinking you may be on to something with the power, I was thinking about that my self. I have a whole raft of the little 22uh chokes, so it's an easy test.
I also put in an order for a superhet 4-channel receiver to see if that has better luck. It has the same pinouts as this one, so it would be a drop-in if it works better.
We'll see how the chokes in the power feed work...