I have quite a bit of this laying around. It is old television cable company transmission lines. I think it’s ps700 but can not tell, can’t find any information on the sheathing. It has a steel traveler on it for hanging overhead. 
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Which coax is this?
- Thread starter nfsus
- Start date
We called that stuff aluminax trunk line. It is 75 ohms and runs pole to pole. No idea what the actual manufacturer's code is for it. I have some laying overhead in the shop.
Depending on the size you might get lucky. The smaller 3/8 inch stuff will take a regular PL-259 if you carefully screw it on. There are some sites online showing how to make your own connectors and adapters for it.
https://www.w9xt.com/page_radio_gadgets_hardline_connectors.html