[ADTech]

There are exactly ZERO current preamps on the market that are compatible with the ROTR100's One-Cable system. The RCA is NOT compatible with it. FWIW, I suspect that feature wasn't even enabled in the product the last time it was manufactured back around 2011. I tried several of the rotors with amps that met their specs and none of the rotors would work with any of the amps

Run two cables, there is no alternative unless you can find one of the really old CM or Winegard amps that were supposed to compatible with it.