SEATTLE - The maps linked below show the expected reach of KING and KONG's digital TV signals which are replacing the current analog broadcast signals, per federal mandate.
Unless Congress opts to delay the transition, on Feb. 17, all television stations in the U.S. will stop analog broadcasting and transmit only in digital. However, KONG-TV, Everett, Washington, will cease analog broadcasting at 9 a.m. on Feb. 6.
Digital TV will work until the signal level at the receive antenna gets below a threshold (41 dBu for UHF), then instead of getting noisy/snowy like analog TV, it will just fail. That's known as the "cliff effect" or "cliff-edge effect" in DTV.
The maps are meant to represent areas where KING and KONG viewers should get analog TV today, and where they are expected to get DTV.
The caveat on these maps is that they do not take terrain into account - if someone has a large obstruction, such as a large hill, between them and the antenna on Queen Anne Hill in Seattle, they probably won't get digital reception. Also, the contours are calculated based on an outdoor antenna at 10 meters (approximately 30 feet) above ground.