These gliders all have their aerial in the rudder (fin is carbon fibre) and at the base of rudder is a BNC connector for disconnecting aerial.
Regretfully when the rudder is removed & replaced the BNC connection should be fully taped up with self amalgamating tape. Over the years without this protection water from tail ballast soakes into connector & cable & green will occur on connector and internals of the RG 58 Coax. This results in aerial SWR of 3 to 1 or worse. Ideally a glider SWR is 1.3 to 1.5 to 1 ratio but 2 to 1 is acceptable in Aviation. This results in very reduced radio range. Warning if you see green (copper or brass or SWR is poor) then you may have to consider visiting a repairer or using a rubber ducky aerial in cockpit and forget the aerial in rudder. Photo shows not too well a corroded/damaged connector. Ian Mc Phee 0428847642 Box 657 Byron Bay NSW 2481
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