This was obviously too much ice for these antennas.
The top antenna might recover when the ice melts. The lower one didn't like it, with a boom failure inside the the upguy connection. How's that for some kind of bending load on the mast? Look at at what the imbalanced antenna loads, due to the icing and the failure are doing to the mast & tower!
Sigh! I'm not gonna run too many EU's this morning.
So, are these HF antennas horizontally, or vertically polarized? Maybe it's circular, the VHF guy are kinda keen on that stuff.
Ok, I give up. Why didn't the boom on the the left side of the tower fail? I would guess that there was more boom length on the the right side than the left. This is generally a poor design practice. Notice that the upguy on the left side failed, the one on the right did not. When the boom gave up the ghost, it pulled the upguy support over 90 deg with it.
Ah yes, the Cushcraft 40-2CD. Wonder if it was the beefed up version. I know...turn it upside down, and make one of those funny looking antennas, with the vee's going up.
All of this is quite sad! Antennas can be designed not to fail under this kind of ice loading. Even, commercially built antennas can be reinforced to carry these loads. It just takes the right design tool, and the effort to sort it out. I wonder which path is cheaper, design the antennas not to fail, or replace/or rebuild them all. This tower doesn't look too straight either, the asymetric element placements of the upper antenna, with their ice collections, have put the tower out of column.
YagiStress can look at all these things on the antenna, if you think they might be important to you.