I have 2 AH-4's. One is permanently mounted in my pickup and drives a 102-inch whip nicely on 40-6 meters. Only fair on 75, so I change the whip to a Hustler for that band when needed. The other AH-4 is part of my marine/portable setup. Use it with a 23-ft marine fiberglass whip on 75-6 with excellent results. 73 de Warren