thanks mutt for the link to that site but i'm looking for something more compact that i could just plug to my laptop and set an antenna on the roof. something with the program and dish. I need it so it can give me a heads up and a 5min window so i can pull the plugs on the lights and let the building cool down before the infrared gets to the building. don't know about the states but in canada its used frequently. normally i just use my ears you could hear them at least a mile away cause they usually fly only a few feet above the house, you could even feel your window shake when there over your house but by that time its to late. i was thinking of just splitting the builing in half and using only half for the time being until the first crop then we'll see about using the other half. the equipment alone to cover the whole builing is almost $150,000. lights will be hung on chains that are pulled across the room 8ft high.