Hi Octane-
From what you describe I assume this is a legit wireless signal loss in the Kama, and not the inactivity timeout in Wiiceiver. You can tell because in the wireless dropout, the LED on your handset will start flashing. If it's the inactivity thing, that LED will stay solid but Wiiceiver will start flashing like nuts until you jiggle the chuck.
Step #1: change the batteries. Better charge == better signal, at least for me. I don't know why, it shouldn't work that way, but if I start having interference issues it's always the batteries.
I've had some success removing the plastic cover on the Kama base, and laying out the antenna inside. You can use your thumb on the back surface to separate the halves. The little board inside is connected with 5 small / fragile wires. Lay it flat (so it's flat against your deck), and be sure to protect it + the wires with 3/4" heat shrink, or electrical tape.
That seems to help with interference issues.