In article , Michael
Chare writes
I want to build a 5m high tower in my garden to hold a 1m diameter
satellite dish.

One option is to build the tower using scaffolding, but does anyone have a
better idea? I have though of the top of an old electricity pylon but they
are not easy to find!

Michael Chare.

I presume that you need the satellite to "see" over some obstruction?. A
section of lattice aerial mast will do very well for that, but to keep
it stable you'll need a cubic metre or two of concrete.

BTW have you asked the planners what they think of the idea as yet?....
--
Tony Sayer