WRZE525

Hey everyone. i live in Ohio where there’s not much elevation change but quite a bit of “rolling hills”. I have trees that are about a quarter mile away from me all around that are about 20-30 feet tall. But anyways getting to my question. I have a retevis RT97 with about 50 feet of Coax and an antenna that’s about 20 feet up. I can only get a little more than 2 miles of signal and I’m wondering what would be best to boost my signal. A taller antenna or an amplifier or both?