Ed wrote:
My QUESTION(s): How effective would a balanced fed dipole of about
100 feet length be on 75M ?

Make it 102 ft. and you will have the G5RV length about which
virtually everything in the world is known. It works so well
on 75m that you should not be able to notice the difference.
How easy/hard it is to match will depend upon the feedline
length.
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73, Cecil http://www.qsl.net/w5dxp