Hard line? If you are talking Heliax, I have a scanner run using 7/8" heliax. 200' run up the tower going to an 8 port multi coupler.
On topic though I use N, TNC or BNC connectors exclusively for RF. The only thing I use a PL259 for is low band and HF. An N connector will terminate to your largest heliax or all the way down to RG58.