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When tuning, start at the bottom and work your way up. Tune the 70cm section first. The middle section for 2m VHF is typically set pretty good factory, with a near 1:1 SWR.The middle section for 2m VHF is typically set pretty good factory, with a near 1:1 SWR. This antenna performs best for 2m VHF. The tiny little offshoot antenna is for the 6-meter band. The top setscrew is for 10-meter. Achieving a 1:5:1 SWR is likely the best you will achieve on 10-meter. For each section there are Allen screws on the top and bottom. Sometimes you will see a single Allen on one end and dual Allens on the other. Always tune the end with the single Allen. For the 70cm section tune at the bottom even though there are dual Allens there.