RT97 Audio +20 mile range

I mounted a Retevis RT97 halfway up a mountain with a Jackery Explorer 1000 Solar Generator and a Magnetic Mount GMRS Antenna on a scrap metal ground plane and relayed clear signals from more than 20 miles away.
The receiver was a Baofeng 5W UV-5R in my home connected to a BTech Amp-U25 30-40W Digital Amplifier and a Little Will Magnetic Mount Antenna recorded by a Liquid Image LIC EGO 727 Video Camera.