Got it. Rigged a small pulley around the chimney, fixed a rope through the pulley to the mast and tied off the other end. Loosened both clamps but couldn't get it out of the clamps. Tied a second rope above the first which I used to pull it free of the clamps. First rop kept mast balanced. Lifted the bottom out of the base plate and stuck it in a cinder block so it wouldn't kick out. Used the first rope to lower the mast down. Swapped antenna and pulled it back up. Set it back in the base plate and into the clamps and tightened everything up. I should have had the pulley secured better and a tad higher but it worked.
In hind site I think a telescopic mast should be free standing with guy wires. I think it would have been easier had I originally set it up that way.
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