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The MFJ-207 can be zeroed back to a particular frequency without a plug in freq counter. Just stick a two foot piece of wire in the MFJ's freq out and place close to the SO-239 jack on the radio having the RF gain turned all the way down. Set the MFJ close to the frequency that you want to check the antenna system with and listen to the radio for the MFJ's signal. Cool!

Of course,the radio has to have a freq counter