Hook it up to your radio , then set your radio to channel one , key the mic then adjust the meter to read the set line , now read the #'s and write them down. Do the same thing on channel 40 then on 19 . If your reading is higher on 40 than on 1 your antenna is long and need to be be shortened . If its higher on 1 then it has to be shortened . Now repeat this until you have at least a 1.1:5 reading.
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