Total posts : 45366
BC Man… What is the ground conductivity in your specific area? Your engineer friend should be able to find that out for you.
In the US, it ranges from 0.5 to 30 millimhos. (Seawater is 5000.) That will have a direct effect upon your range. I live in a 15 to 30 millimhos area. 0.5 is terrible.
BC: << I’ve got three 8′ ground rods and the antenna is on top of a 35′ building. I’m doing some audio processing to boost the signal. >>
Are the wires to those three rods close together? If so, they will act nearly as just one wire (mutual inductance from inter-coupling) and thus defeat the purpose for having three.
Too, the wires to those ground rods could look like — to the FCC — as 30+ foot extensions (counterpoise) to your antenna system.
Bill in SE Texas