@barra,
I'd suggest a HD15 plug (used for VGA monitors), sometimes called a high density DB15. Radio Shack sells both the male and female sides.
The pins are probably capable of handling enough current, though it might be a good idea to double up the high load (e.g. airsoft gun), heavily used (e.g. turret) and common power connections.


@Bill,
It's possible the antenna "joiner" was sitting on something that was disrupting the signal. You could carefully shrink heatshrink over both halves on the socket (when doing the female, make sure the male pin is installed or it'll shrink it up too tight!), or just be carefully to tuck it where it can't get into trouble.
Maybe post your request for help in a new thread next time to make it easier to track which posts are which?

D.