Oh yeah EEPE I remember that now!
That's a shame about the quality issues. Did they really use a Atmega88? Damn my OSD code is 14k with arduino bootloader... Maybe able to squeeze out some stuff like the artificial horizon and make it below 8k... It's almost worth replacing the MCU with a atmega168.
Oh BTW I forgot to say that video I posted was done by recording just the OSD output while replaying logged data and overlaying it on the key chain camera video in the video editor.
I did think about diversity, but I don't know anything about RF to design a RF stage with switches. I was thinking about having 2 RFM22 modules on one PCB, which could also allow you to transmit and receive at the same time.