Contents 1 FM 1.1 Zones I and I-A 1.2 Zones II and III 2 TV 2.1 Maximum HAAT 2.2 Minimum co-channel separation 3 Zone layouts 4 See also 5 External links

FM[edit] Zones I and I-A[edit] Maximum HAAT: 150 meters (492 ft) Maximum ERP: 50 kW Minimum co-channel separation: 241 km (150 mi) Zones II and III[edit] Maximum HAAT: 600 meters (1968 ft) Maximum ERP: 100 kW Minimum co-channel separation: 290 km (180 mi).

TV[edit] In all zones, maximum ERP for analog TV transmitters is as follows: VHF 2-6: 100 kW (analog); 45 kW (digital) VHF 7-13: 316 kW (analog); 160 kW (digital) UHF: 5,000 kW (analog); 1000 kW (digital) Maximum HAAT[edit] Zone I: 305 meters (1000 ft) Zones II and III: 610 meters (2000 ft) Minimum co-channel separation[edit] Band Zone I Zone II Zone III VHF 272.7 km (169.5 miles) 304.9 km (189.5 miles) 353.2 km (219.5 miles) UHF 248.6 km (154.5 miles) 280.8 km (174.5 miles) 329.0 km (204.5 miles)

Zone layouts[edit] Zone I (the most densely populated zone) consists of the entire land masses of the following states: Connecticut, Delaware, Illinois, Indiana, Maryland, Massachusetts, New Jersey, Ohio, Pennsylvania, Rhode Island, and West Virginia; in addition to the northern and eastern portions of Virginia; the areas of Michigan and southeastern Wisconsin south of 43° 30' north latitude; the coastal strip of Maine; the areas of New Hampshire and Vermont south of 45° north latitude; and the areas of western New York south of 43° 30' north latitude and eastern New York south of 45° north latitude. In addition, Zone I-A (FM only) consists of all of California south of 40° north latitude, Puerto Rico and the U.S. Virgin Islands (If the dividing line between Zones I and II runs through a city, that city is considered to be in Zone I.). Zones I and I-A have the most "grandfathered" overpowered stations, which are allowed the same extended coverage areas that they had before the zones were established. One of the most powerful of these stations is WBCT in Grand Rapids, Michigan, which operates at 320,000 watts and 238 meters (781 ft) HAAT. Zone III (the zone with the flattest terrain) consists of all of Florida and the areas of Alabama, Georgia, Louisiana, Mississippi, and Texas within approximately 241.4 kilometers (150.0 mi) of the Gulf of Mexico. Zone II is all the rest of the Continental United States, Alaska and Hawaii.

See also[edit] Above mean sea level (AMSL) Above ground level (AGL) Canadian Radio-television and Telecommunications Commission (CRTC) List of broadcast station classes United States Federal Communications Commission (FCC)

External links[edit] 47 CFR Part 73 Index (2005) FCC: Mass Media Calculated Contours FCC: HAAT Calculator "Superpower" Grandfathered FM stations Retrieved from "" Categories: AntennasBroadcasting

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