HI, were trying to get better wifi signal in our small shop that's about 75-90 feet from the house front door. The modem and router is hooked up to the house computer near the front door. Trying to find out what are my best options. The modem is a Sudden Link telephony modem and the wireless router hooked up to it is an Apple Express Base Station. Any help would be really appreciated. Some more info: using a Alfa usb antenna and in its software it says the signal strength varies from 50-58% and link quality 100% but the speed really varies from 7mbps to 29mbps.