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Terrestrial Broadcasting
Terrestrial Television, Digital and Analogue
Best aerial to combat cross-polar and rear-direction interference?
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<blockquote data-quote="Terryl" data-source="post: 1060566" data-attributes="member: 369937"><p>The more forward director elements the antenna has the tighter the front beamwidth, however if you want a better front to back rejection (F/R ratio) a simple modification to the antenna can be done.</p><p></p><p>If you look at some of the antennas you have listed you will see the back reflector, it looks like a flattened "V", this can be modified by adding a simple aluminum window screen (no larger then 12mm mesh and without the frame) to it, make the screen about 15 cm larger on all sides then the back reflector, attach with aluminum wire and your set.</p><p></p><p>This will improve the F/B ratio, how much is anyone's guess.</p><p></p><p>A more complicated setup is a Faraday shield, this consists of two screens separated by an insulator, (wood, PVC pipe or fiberglass) this shield is not touching or directly connected to the existing antenna but is mounted directly behind it, it is Earth grounded at one single point, (both screens) this shield is 3 to 4 times the size and shape of the antenna it is shielding, something like this can totally block most signals from the back side of the antenna it is protecting.</p></blockquote><p></p>
[QUOTE="Terryl, post: 1060566, member: 369937"] The more forward director elements the antenna has the tighter the front beamwidth, however if you want a better front to back rejection (F/R ratio) a simple modification to the antenna can be done. If you look at some of the antennas you have listed you will see the back reflector, it looks like a flattened "V", this can be modified by adding a simple aluminum window screen (no larger then 12mm mesh and without the frame) to it, make the screen about 15 cm larger on all sides then the back reflector, attach with aluminum wire and your set. This will improve the F/B ratio, how much is anyone's guess. A more complicated setup is a Faraday shield, this consists of two screens separated by an insulator, (wood, PVC pipe or fiberglass) this shield is not touching or directly connected to the existing antenna but is mounted directly behind it, it is Earth grounded at one single point, (both screens) this shield is 3 to 4 times the size and shape of the antenna it is shielding, something like this can totally block most signals from the back side of the antenna it is protecting. [/QUOTE]
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Terrestrial Broadcasting
Terrestrial Television, Digital and Analogue
Best aerial to combat cross-polar and rear-direction interference?
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