Stan,
One reason for a "U" is since you have dual downleads with the far end grounded
and the feed end fed against ground you have only one fourth the ground losses.
By the way I used airdux coils at each end and my Z into the transmitter was
about 90 ohms.
The second reason is that when the lightning season comes the antenna is
grounded. I lost an inverted "L" antenna to lightning back in Cincy in about
1969 due to a coming storm out on the horizon. Well it is a good way to meet
neighbors whom you have never met before. SMILE!!! With the inverted "U"
antenna lightning struck a tree across the street but did not bother the 90 ft
high inverted "U" antenna during the 10 years I had it up.
73, Curt W0ALC (ex K8IBQ) Durango, CO.
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