As a source for renewable energy, wind farms are being installed throughout the upper Midwest. Being subsidized by the US Government heightens the interest of entrepreneurs in building these for profit. Some wind farms contain hundreds of windmills. One of the biggest is on Buffalo Ridge between Marshall and Pipestone, Minnesota. Other large farms are northwest of Mason City, Iowa near Joice and northwest of Algoma, WI. The largest of the windmills and farms are in the western US.

The zoning laws of each state vary based on the generating size of the group of windmills, called a wind farm. Below a certain size in generating capacity, local city and county planning and zoning regulate these farms. Above a megawatt threshold, the state enters the picture especially in Minnesota.

Wind farms have their down side that is often overlooked by champions looking for clean renewable energy and profits.

1. Windmills have aviation hazard flashing beacons displaying a flashing light display. Some are set in a sequence to flash together or individually as a marquee across the farm. Because most windmills are above 201 feet, the Federal Aviation Administration dictates they be marked as an aviation hazard. The hazard beacon can be red at nighttime, medium intensity white strobe lights used in daytime (sometimes at night), or a combination of both.

2. The metallic blades chop and reflect certain types of radio signals ruining the continuity of the communications circuit. This is the subject of this paper.