I recently hooked my grandparent's pc back up after they had it fixed. It is hooked up to the router by an Ethernet cord. This I already knew. But there were also two antennas in the back for the wifi (very loose and broke when I tried to tighten them.). Our WiFi has always had problems. Is this what is causing the issues? Are their antennas causing the interference with the rest of the wifi? Because the internet provider insists there are no issues.