Hi, I have a copper J-pole on the roof of my house. My swr on 146.520Mhz FM is as follows:
1/2 watt = between 1.0:1 and 1.1:1
9 watts = 1.2:1
130 watts = 2.5:1
160 watts = 4.5:1
Why would it be so good on low power and bad on high power?
P.S. I am running RG8-X (mini-8) coax. (about 60')