It's not that bad, that station is LOS for you, and IF the Ellipse is pointed close to it, (VHF it has about a 60 degree beam) you should not be having breakups. However, it IS on High VHF rf12 which means any sort of electrical interference from power bricks, LED lightbulbs, lawn tractor battery tenders and the like can cause all sorts of interference and breakups.
I also have a RF12, WJRT, and years ago had the same issue. I first tracked it down to a Harbor Freight battery tender on my lawn tractor, several hundred feet away in the garage. I unplugged that, and the breakups stopped. A few weeks later they started up again. That time it turned out to be a Dell laptop power brick that was doing it. I bought a new one, and have never had issues since.
So, you need to track it down. Maybe turn OFF all your breakers in the box except for the one for your tv set, and the antennas power injector. IF the station then stays steady with no breakups, start turning on other breakers one at a time, and see what happens. IF you flip one on and the interference starts, track down what on that circuit is causing it. Even some certain brand LED lightbulbs can do it.
Hopefully whatever is doing it is in your control, on your property, and not a neighbors, or a noisy transformer out on a power pole. Those can be tracked down with an old-school AM pocket radio, set low on the dial where there's no station. Interference will be reflected in the noise your hear.