On Sun, 14 May 2017 15:58:44 -0700 (PDT)
Andy wrote:

I have an antenna mounted on a pole that is attached to a block of
wood.

Sometimes I have to change the antenna position.

I would like something to put under the wood that would allow the
wood to rotate freely.

All I could think of was a wheel bearing.

Any other ideas ?

https://www.wwhardware.com/lazy-susa...s-and-bearings

http://www.basspro.com/Boat-Seat-Swi...uct/421852130/