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Without any doubt, the TV tuner needs to be set to 'antenna' or 'air' mode. Your temporary success in 'cable' mode suggests you were connected to a cable company service, perhaps left in from the previous home owner. Perhaps the cable company did work in the neighborhood recently and audited the connections. In some cases they would simply disconnect your drop at the pole or pedestal. However it's possible they added an inline filter. If there is any type of cable company service connected to the coax in your home, you can not use that coax to convey OTA signals from your antenna.
1) Make certain that the cable company is not connected to any coax that your antenna and TV are using. Both will interfere with the other and possibly other over the air services.
2) Make certain that your TV is set to 'antenna' or 'air' and that you've performed a full channel scan.
3) If this fails to produce good results, ie. dozens of reliable channels, then reduce the system to the antenna, a single new 50' cable, and the TV. There may be problems with the coax or splitter(s) left in by the previous owner.
Basic trouble shooting starts with the establishment of a known good source, the antenna in this case. Then add parts like splitters and additional cables. If they fail, you focus on the part that did not perform as expected rather than guessing at everything.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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Last edited by GroundUrMast; 4-Oct-2013 at 5:58 PM.
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