Butcherman wrote:
Recently got back into radio after 15 year absence..... Have a
question for you antenna gurus. I want to put up a 135 foot doublet.
Question is: Does it need to be supported in the middle? The layout of
my property has no support for the middle of the antenna.

It depends on how much sag you can tolerate. Less sag and/or more feedline
& antenna weight = greater tensioning.
Bryan WA7PRC