Basket masts? Looks like it. I recently got some emails from one of the retailers regarding selling these things separately. Frankly at that scale I didn't think they looked too great. I'm holding out for someone to sell them for BB-39 in 1/350 scale...
Thanks for the notice, John. My understanding is that the theory was that they would, as geodesics, absorb direct hits in the form of a pass through set of holes, than tripod masts which were severely shot up at Jutland. But with the advent of precise optical range finding they proved to be too flexible.