At 11:32 05 February 2020, Martin Gregorie wrote:
On Wed, 05 Feb 2020 10:21:13 +0000, Colin Roney wrote:

I admit I am a total dummy when it comes to glider electrics and
navigation installation stuff but I am very keen to try and correct the
situation. Does anyone have any ideas for suggested reading in order to
try and understand the subject.

Snip
The antenna has a Belling-Lee flying
connector to the built-in glider antenna cable.

I would argue very much against the use of Belling-Lee connectors. For a
start they are not Moisture-Proof and moisture between inner and outer
conductors gives ****-poor performance.

Use BNC (or TNC) antenna connectors assuming your cable is UR43 or similar.
But whatever you use, it must provide an air-tight seal, connected or not.