If I need a 65 to 70 foot counterpoise for 80 Meters and a 8.6 foot one for 10 Meters and my balun from my end-fed antenna is 10 foot up do I need to add 10 feet to the math to get the counterpoise to ground level for it to be effective. In the example of 10 meters the wire is just hanging in air. These would be run opposite to the feedline. Thanks! Bill