Channel Jumper wrote:
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.

In those days, we could buy raw stock from the bureau of the amateur
radio association, who obtained it from local antenna manufacturers that
we still had back then.

Dipoles already to size for VHF/UHF bands, and elements to the maximal
length required for each band, that you cut down to the correct length
for your design.

Those elements already had the mounting block and bolt just like the
commercial TV antennas. I made 2M and 70cm crossed yagis for satellite
operation out of those parts.