Hello, my name is Rusty. I'm an expert in wireless frequencies. How far away is the handset from the base unit when you get static?
I don't believe a range extender is going to help you. What you're getting is interference from another device, like a TV set, a motor, or another electronic device that is taking over the phone's frequency. Move the base unit a couple of feet and see if that clears it up. Move it away from all electronics for testing purposes, and tell me if you have any clearer signal.