Are you scanning in cable or air (antenna)? If you are scanning in cable mode and the antenna amplifier is on, it will not find any stations. Also Seiki TVs do not have an QAM tuner so it will not find coded cable stations.
Put the antenna up. Turn on the antenna amplifier. Scan the TV in "AIR" mode for antenna channels and see if that finds TV stations.
When you said it worked at the dealership -- was it plugged into cable or was the dealer using the antenna?
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Ed & Bev Felker
Retired USAF Col and retired Nurse
Traveling with Lily & Bella ('Teddy Bear' breed)
2015 Vegas 24.1 (E-350)
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