If you need to wait until warm weather to get up on the roof (that wait would annoy me to no end) then maybe you can consider getting a a
small indoor antenna and some new coax. Connect it to one television, run the coax out a door or a window and aim west. Just to see if the problem clears. Your TV Fool Report shows no height from the ground and the signal strength is strong. I'd be surprised if you can't manage to find a sweet spot to get your channels. [This would not be a permanent arrangement but it would be a pretty cheap experiment.]
If it turns out that the ANT-751 is not big enough because of the trees you might be able to go with a larger antenna (maybe something like an HBU-33 or HBU-44).
But when warm weather comes I'd agree with GroundUrMast. Check every connection. Run a new length of coax directly from the antenna to one television to test. Make sure your antenna is pointed correctly.