I am using a desktop pc. I connect through an antenna on my roof. I believe it is an RF signal but could be microwave. Cable comes down my wall into a Linksys router and to my computer. We use the router because we also have a laptop. It had been working fine for a long time with no trouble. Now it disconnects from the internet about every 1/2 hour like clockwork. I have to unplug the power to the router and plug it back in to get my connection back. Even when the connection is lost the internet light on the router is still on. My provider can't find the problem either. He monitored the signal for 24 hrs from their tower to my antenna and it showed no interruptions. It has to be somewhere from the antenna to the router. I originally though my router was bad so I bought a new one and it still does the same thing. I thought it might be something in my computer so I connected my secondary desktop up and it still does the same thing.