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Here some and not all build your own antenna web sites.
http://www.wtfda.org/mem/rhombictvants.pdf.
http://www.wtfda.org/mem/rhombic.pdf.
http://www.mapability.com/ei8ic/rhombic.php.
http://www.ccdxc.org/ant_calc.htm.
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http://www.antennacraft.net.
Has the already built , Y5-2-6 , VHF channels low band 2 thru 6 antenna.
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And it looks like ,
http://summitsource.com.
Has the , Winegard YA6260 , VHF channels low band 2 thru 6 antenna.
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Antennas of the 3 Tv channel bands.
VHF low band channels 2 thru 6.
VHF high band channels 7 thru 13.
UHF band channels 14 thru 51.
can be connected with separator / joiners.
HLSJ = VHF high band / low band , separator / joiner.
UVSJ = UHF band / VHF high and low band , separator / joiner.
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Reversed splitters;
Basic splitters have direct wire connections on the inside the splitter , this allows signal strength bleed off from one antenna to another antenna.
To limit signal strength bleed off use.
Use capacitor coupled splitter.
Or use micro strip line coupled splitter.
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Antenna selection can be done with a A/B switch and combinations of A/B switches.
http://www.mcmelectronics.com.
Model , 32-4425
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Or can use separate tuners connected to the separate antennas and to the Tv.
http://www.epvision.com