Lower 15m beam slipped

It’s been windy here the past few days and the lower 15m beam seems to have slipped a bit when I checked antennas this afternoon. Luckily, it’s restricted by the tower face and can’t go too far so the feedline appears to be alright.

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Low 4L15 spun by the wind

Why does this sort of thing happen? Because the tower leg is too thin for the existing U-bolts on the boom-to-mast plate. I should have drilled the plate for smaller U-bolts before raising the antenna and fixing it to the tower, but it was a few days before CQWW and I had run out of time. There’s little sense in repairing at this point, as this antenna will be taken down with the rest in anticipation of moving to a suitable QTH. I will probably climb up and use rope to secure it, simply to prevent pinwheeling.

This antenna (and the one up top) are homemade 15m monobanders using parts from Cushcraft 4L10’s. I needed minor extension in the elements (only a few inches each) and I extended the boom. I’ll post full details later, in case anyone else wants to try this conversion. They sit on a telescoping tower that is controllable from the shack so we can adjust spacing using a ground-mounted winch. This has been an interesting platform for experiments in stack design; at some point I’ll compile what we’ve learned.

73,
Mike

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