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Old 15-Apr-2015, 6:46 PM   #7
stvcmty
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Join Date: Mar 2013
Posts: 135
LOS stands for Line of Sight. It means the antenna at your house can see the antenna the TV station uses. If you could get an antenna up high enough for LOS, the received signal strength could double, cutting the size of antenna you need in half, or giving you twice as much signal margin to prevent the picture breaking up.

HLSJ is a (VHF) high-low splitter joiner. It lets a channel 2-6 antenna be added to another antenna.

VHF low antennas (CH 2-6) are wide, and to get modest gain they need to be long; which leads to a heavy antenna. A heavy antenna mounted up high puts tremendous force on a mast/mount, especially if the wind is blowing.
VHF high antennas (CH 7-13) are not as wide and to get moderate gain they need to be long, so they can be unsightly but are not terribly heavy.
UHF antennas (CH 14+ (14-51 or 14-69)) can have high gain in a small package (wide and thin, long and narrow), or they can be big in fringe situations.
A VHF high/UHF antenna (CH 7-51(69)) will be long, but only about 2’ wide, so it is less wind load than an all band antenna. As a side benefit, UHF signals will gain the most from being up high. So if I lived where you live, you would see a high gain VHF-H/UHF antenna on a rotor, about 6’ of space then a VHF-L antenna right above a tripod. The two antennas would be combined with a HLSJ, and feed a RCA preamp.
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