I had a similar problem with the AmazonBasics 35 mile amplified antenna, where (oddly enough) CW was breaking up. I switched to an RCA ANT751R antenna and an RCA pre-amplifier, with the antenna located in my attic. That single change doubled the number of channels I receive from 21 with the Amazon antenna to 43 channels from the RCA. The ANT751R is about 3-feet square when it’s unfolded, and I have it bolted to one of my roof-joists in the attic.At your distance you probably wouldn’t need the amplifier…