These devices, made by Channel Master, are single channel diplexers (combiners). They permit a single channel antenna to share a feed-line with a wideband antenna. However they mess up reception for the adjacent channels. Thus a Join-Tenna cannot be used for a channel adjacent to another channel you want. (Since there are gaps between channels 4-5, 6-7, and 13-14, this restriction does not apply to them.)
The Channel Master website says Join-Tennas are available only for channels 6-69. However Warren Electronics claims to have Channel Master Join-Tennas for channels 2-69.
There is a unique Join-Tenna for each VHF channel. But UHF Join-Tennas are adjustable, and there are just three of them for covering 14-29, 30-49, and 50-69. The seller will adjust it for you. But they tend to be a little slow, so acquiring one of these can take some time.
[img]http://www.hdtvprimer.com/ANTENNAS/JoinTenna.gif[/img]
Join-Tenna
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