Our business is spread across two buildings. The main building has WiFi, but the secondary building barely picks up that signal. I use an iPad in the secondary building, but it picks up a weak signal from the main building. Are there any external antenna devices that can pick up and amplify that WiFi signal? I guess an antenna that works like a repeater would be nice. Are there any such products on the market? I don't know exactly what to look for. Thank you!