LG 47LB1DA Owner's Manual page 21

Antenna
To improve the picture quality in a poor signal area, please purchase a signal amplifier and install properly.
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If the antenna needs to be split for two TV's, install a 2-Way Signal Splitter.
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If the antenna is not installed properly, contact your dealer for assistance.
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NOTE
!
The TV will let you know when the analog, cable, and digital channel scans are complete.
UHF
Signal
VHF
Amplifier
ANTENNA
IN
CABLE
IN
19