[TowerTalk] Battle of the bearings

[Mike]

I like to get thoughts/experiences about Rohn TB3 bearings vs. Glenn 
Martin TB25.
The antennae will be a 4 element SteppIR and an M2 6M7JHV on 20 feet of 
2" chrom-moly.

I plan to use 2 bearings. Can the bearings be mounted on a rotor shelf 
(25G tower)?

73, Mike NF4L