I am hoping to get a home weather station which will need a 12 metre tower.

 

There will be little weight on it and it needs to be around 12 metres tall to clear the surrounding trees for the wind direction and the anemometer. 

 

I have done a Google search but nothing seems to show up.

Perhaps this will give you some ideas. 

 http://www.freeantennas.com/ 

  How to Build a 76 Foot Tilt Over Tower
(for antenna mast, light pole, or other light duty service)

  http://www.freeantennas.com/tilt-over-tower/index.html

 

Please do have it reviewed for fitness to your purpose.

howto

 

1 hour ago, howto said:

Perhaps this will give you some ideas. 

 http://www.freeantennas.com/ 

  How to Build a 76 Foot Tilt Over Tower
(for antenna mast, light pole, or other light duty service)

  http://www.freeantennas.com/tilt-over-tower/index.html

 

Please do have it reviewed for fitness to your purpose.

howto

 

I am hoping to buy a home weather centre, which is why I am looking for towers.

 

I can probably get one made using 2 inch metal pipe, 6 metres long giving me a maximum of 12 metres, a 2 inch base plate and guy wires at the 4 and 8 metre points to anchor points with turnbuckles perhaps 3 metres away.

 

The anemometer will be the bit at the top which needs to clear the trees and the rest should be mounted at the base.

 

If it comes off I can run a ground pole as a lightning conductor, clamping it to the hast every 1 metre to a copper ground bar at the base, then run them out to 4 copper ground bars buried in the earth and interconnected.