Ok using the provided zip code of 98370 , all most all channels are Line Of Site L.O.S. and the signals are Very Strong at 64.1 NM (dB). . . 0 NM (dB) is the reference point for reliable reception , so 64.1 is Real Hot. . . Looks like 'To Hot' for a antenna with a built in amplifier. What can happen is the built in antenna amplifier can over load and the digital tuner in the Tv will over load. Digital Tv Tuners do not like to over load. Digital Tv Tuners say Ok if thats the way you will play , then I won't play. I suggest a simple NON Amplified indoor antenna , one of the ones listed here . .
http://forum.tvfool.com/showthread.php?t=233 . . . Also KOMO Channel 4 is now a Virtual Channel , the Real Channel is UHF 38 and KING 5 is now a Virtual Channel , the Real Channel is UHF 48. . . Also I suggest moving the NON Amplified Antenna away from interference generators. What can be a interference generator? All most any thing , even a computer or a DVD player or even an other Amplified Tv antenna or even a cord less phone or a light dimmer control. Connect the Non amplified antenna directly to the Tv , all other devices unpluged. . . Switching off and unpluging devices is a way to find a interference generators , put more interference suggestions here---->>>_____________________________________________________________________________ __________________