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[QUOTE=&quot;Fringe Reception, post: 52564, member: 4739&quot;]Above, what Serendipity said is spot on:Saying it another way, your antenna system has to approach 75 ohms impedence (not a direct-current measurement as seen on an ohm-meter) for it to efficently pass RF signals to your TV set.&nbsp; That's what your receiver 'wants' to &quot;see&quot; because it was designed that way.In specific situations anything is possible: an example from my LF Ham radio days: if you used an antenna tuner connected to a copper stake nailed into the stump of a long dead tree (1953 Radio Amateurs' Handbook) it could become a useable transmitting antenna (only because the antenna-matcher allows the transmitter to not self-destruct).&nbsp; NOT to say this would an efficent transmitting antenna and the receiving results on the same 'antenna' will be virtually non-existant!&nbsp;&nbsp; I think the 'concept' of an antenna matcher is a wrong choice for OTA HDTV, certainly wrong for UHF frequencies/channels.Back to today: anything between your antenna and your receiver 'theoretically' attenuates the signal -- even joining two coaxial cables to each other to extend their length generates unexpected losses.&nbsp; If there is an A-B switch between antenna systems, there may be LOTS of loss (view my switch folder here).&nbsp; I wish Piggy would chime-in and add to this post because his experience is beyond mine.Jim[/QUOTE]

[QUOTE="Fringe Reception, post: 52564, member: 4739"]Above, what Serendipity said is spot on: Saying it another way, your antenna [U]system[/U] has to approach 75 ohms impedence (not a direct-current measurement as seen on an ohm-meter) for it to efficently pass RF signals to your TV set. That's what your receiver 'wants' to "see" because it was designed that way. In specific situations anything is possible: an example from my LF Ham radio days: if you used an antenna tuner connected to a copper stake nailed into the stump of a long dead tree (1953 Radio Amateurs' Handbook) it could become a useable transmitting antenna (only because the antenna-matcher allows the transmitter to not self-destruct). NOT to say this would an efficent transmitting antenna and the [I]receiving[/I] results on the same 'antenna' will be virtually non-existant! I think the 'concept' of an antenna matcher is a wrong choice for OTA HDTV, certainly wrong for UHF frequencies/channels. Back to today: anything between your antenna and your receiver 'theoretically' attenuates the signal -- even joining two coaxial cables to each other to extend their length generates unexpected losses. If there is an A-B switch between antenna systems, there may be LOTS of loss (view my switch folder here). I wish Piggy would chime-in and add to this post because his experience is beyond mine. Jim[/QUOTE]

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