On Netgear routers, go to LAN Set-up, then under "Address Reservation", select "Add" and reserve an IP address for the computer you are using. This forces your computer to be assigned the same address each time you start it up. Then, go to "Port Forwarding/Port Triggering", select "Add Custom Service", use TCP/UDP, enter port number, and then the IP address you resevered. You will have to do this for both ports 3290 and 3782. 3782 is for Air to Ground voice, 3290 is for Ground to Ground voice.
This should solve your problem. I was not having the static issue you are, so I do not know if this will help that.
Hope this helps,