Rather than buy another cheap rotator, could I just use 2 good UHF antennas and mount them 20' apart pointing in 2 directions? (My locals are in only 2 basic directions - about 180 degrees from each other).
Combining UHF signals from 2 different directions can be a problem. What happens is that 1/2 of the signal from each antenna goes down the wire to the TV but the other half is re-radiated out the other antenna. Then on top of that you will a have combiner loss, and possible multi path problems from the same signals hitting both antennas at slightly different times. If your signals are weak to begin with you essentially cut them in half.
While in some locations it can work. At 180 degrees you stand a better chance of having it work if the signals a strong enough from both directions then you would at other strange angles. Its better to run two separate cables to each TV and use an antenna switch there to select the antenna you need.
If you post a TV Fool report we could get a better idea of what might work at your location. https://www.tvfool.com/index.php?option=com_wrapper&Itemid=29