He is getting faster internet across 6 kilometers of water than what I get across my family room.
I'm running a 5 GHZ wi-fi router, which is around double the frequency of your microwave oven, probably at 100 milliwatts. He is running a 60 GHz transmitter, which is very high microwaves, at an unknown power.
My mother and step-dad couldn't get internet to work 3 miles outside of North Vernon, Indiana, using Verizon Wireless as the provider. Fortunately, they now have fiber internet, although at a low speed of 4 to 5 Mbs.