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Ummmmm.....I should point out that the 102 inch antenna I have is indeed fiberglass and I still had to cut about two inches off it and NOT use a spring to make it useable on the high end of 10m. I used to work 10m FM quite a bit years back and wanted the antenna bandwidth to allow a half decent SWR on 29.500-29-700 MHz as well as down near 28.400. Leaving it at the stock length of 102 inches made it fine for the low end of 10m but unacceptably high for the FM portion of the band.


The thing to remember is that the same antenna mounted on different vehicles or even in different locations on the same vehicle can and will affect the overall impedance somewhat to varying degrees. It has too. You are changing the other half of the antenna system.