de WB2CPN 2002.03.15 I have a 4-inch coax and a 1:1 balun on my AH-2 and AH-4's. They feed 50 feet of ladder line and a center fed antenna. An electrically short piece of coax will look to the AH-4 like added capacity to ground on the output. A properly terminated coax longer than a quarter wave will let the AH-4 see the line impedance. So, coax on the AH-4? Sometimes...73