On 10/08/2020 01:30, wrote:

I'm in the process of finishing the feedline for my 80m dipole,gonna use it for 80/75,40& 30 m, any suggestions for a lengths ??

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You'll find some wisdom on the matter at
http://www.w5dxp.com/notuner.htm

Cecil Moore is no doubt the guru on doublets . As per the above ,see his
extensive web site.

Frank , EI7KS