I used aluminum masts at my P40A station. I had stacked monobanders on
them. The mast was Ø2 1/2" with a heavy wall and it never had any corrosion
issues, unlike the Rohn 55g tower.
John KK9A
Stan K5GO wrote:
Here is seat of pants. You can put a rather large antenna on a piece of
water pipe if the antenna is mounted about 3 inches above the top of the
tower. Imagine the force it would take to permanently bend a piece of 1.5?
schedule 40 water pipe 3 inches from where it was secured.
Nobody talks about aluminum but I have 15 feet of 2? OD, 3/8? wall 6061-T6
that was installed 50 years ago with a 2 element Mosley 40 at the bottom a 4
element Cushcraft 20 in the middle and a little Hygain DB1015 at the top.
It was changed a few years ago to something different. It had seen some
tremendous winds but never a problem in 50 years.
It would be interesting for someone like K6OK to tell us an example of how
many SF you could have at 3 inches, 7.5 feet and 15 feet with that aluminum
mast and survive about 90 mph over which is when those elements would
probably have been stripped off.
Stan, K5GO
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