Quote:
Originally Posted by Sal[_4_]
I'm building a yagi from the measurement tables the ARRL Antenna Book. I
have the driven element finished and getting a good SWRs with a home-made
gamma match.
I'm going to mount it on a wood 2 X 2 with as many directors as will fit on
an 8 feet boom.
Any advice? (I've already read that a gamma match is a poor choice but it
did work, so we can skip that one. :-)
"Sal"
(KD6VKW)
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If you delve deeper, you will read that each time you add directors - you have to recalculate the spacing between each director.
The length of each director and the spacing is very important.
Wood is a poor choice for anything more then a experiment - it is heavy, and not very strong.
If you are serious about building that antenna, you would want to look for a old UHF / VHF television antenna such as the Radio Shack VU 190.
Rob the elements off the antenna, cut them to length and mount your gamma match to it with a appropriate sized reflector.
There was a channel master VHF antenna that was made back in the 1970's that was about 24 feet long which also made a excellent donor antenna / platform for a home brew beam antenna.