[Milsurplus] MT-133 / ASA-1 ?

[Hubert Miller]

I found a little metal bracket like for mounting some kind of small ( broadcast radio sized, I guesstimate ) telescopic antenna to the side of some
equipment. I don't have the item before me now, but as I recall, it is engraved with the marking, " MT-133 / ASA-1 ".  What is this part of ?
tnx-
Hue
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