greenfly in my powerbook

I have greenfly crawling into the vents on my powerbook. This is because I am sat in the park and connected via wireless ethernet. My access point seems to waver in and and out of range, but a steady 30% signal seems to be maintained. With an external antennae on the house I could sit even further away. I’ll be fending the war-drivers off with sticks though. I need an EMP gun.