hemyd wrote:
I need to build a basic TV antenna, "heavy duty" to withstand the
weight of large birds landing on the elements. Are there any sites
which give design specifications for TV antennae?


Build it? OK, if that is your thing and you don't put a price on your
labor. But you might be better off buying one designed for cable-tv
head end use.

http://www.kathrein-scala.com/vhf-tv_yagi.php
http://www.kathrein-scala.com/uhf-tv.htm

http://www.blondertongue.com/reception/Reception.pdf

http://www.tacocommunications.com/TA...agi%20y10x.pdf