Why don't you tap the ATU TUNE button and see what happens? 73, Don W3FPR On 4/11/2020 5:06 PM, John Stengrevics wrote: > My 6 meter antenna reads an SWR of 10:1 on 10 meters. The KAT3A specs suggest it can tune that degree of mismatch. Is it reasonable to think that the KAT3A could match my antenna well enough for 10 meters? >