On Dec 13, 6:17*am, "John W"
wrote:
Thank you for your comments so far folks.

J Todd and Philo, putting the cable straight through the wall omitting the
two connectors is certainly worth me considering.

Rob, to answer your questions I will mainly be using frequencies up to
146MHz but with the hope of going into the low microwave bands in the
future. *I will be able to put the connectors back to back so their centre
conductors can be soldered directly to each other. *This would mean that the
connector bodies are about 10mm apart.

Could you cut a small piece of copper pipe of the right diameter in
half then solder it around that centre pin? Simulating a small piece
of hardline coax?