Thanks Grahame. Been thinking about making a collinear antenna for awhile. Wasn't sure of the formula. Looks like a New Year's project to try.
Have a left over length of LMR400 from the original ADS-B antenna installation that will come in handy.
Will be interesting to see what improvement the LMR400 over the RG58 feed does to your setup.
Happy Christmas,
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Cheers,
Noel White
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