antennas needed are determined by real channel:
http://www.rabbitears.info/market.ph...&callsign=krbk
3.1 virtual is real channel 44
10.1 virtual is real channel 10
21.1 virtual is real channel 23
27.1 virtual is real channel 28
33.1 virtual is real channel 19
49.1 virtual is real channel 49
Do you have the corrected and uncorrected numbers reversed?
What happens if you connect each antenna directly to your TV instead of the Roamio? Does your TV have a signal strength indicator?