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I am looking for some advise on the siro 827 I want to swr the Antenna for the 27.555 and also I use 27.385 so do I do the Guide on the instructions 27.5 says tune 300 mm if I set it to this will the swr be very high on the 27.385 also do I measure from the tip of the antenna with the plastic top ...

My little set up

Hello just joined this wonderful site today my ssb call 26mu876 Paul from sunny Leeds