I use a lot of it. LDF5-50A, specifically: This is .875" Heliax, and 50 Ohms nominal impedance. Other variants are available.
Its data sheet is here:http://www.dateline.ru/download/datasheets/Andrew_LDF5-50A.pdf
The most common cable end connector is the ordinary Type N, which clamps onto the cable and looks like this:http://www.tessco.com/products/displayProductInfo.do?sku=457744&eventPage=1
Other connectors are available, too, but they all cost more.
If you want to make a "bulkhead" panel for these, you'd use ordinary, plain-old-vanilla Type N bulkhead adapters, install Type N male connectors on the cable ends, and just screw them in.