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Old 12th December 2012, 04:26 PM   #11
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Good grief. That is all.
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Old 12th December 2012, 05:26 PM   #12
DF96 is offline DF96  England
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Yes, these long-wire UHF antennas seem to be popular in the US. Never really caught on over here. The need for an amplifier raises doubt about the effectiveness of the antenna itself. Except for fringe reception I think amplifiers are best avoided.
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Old 13th December 2012, 04:13 AM   #13
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Location: Dallas
The LNA is just an impedance matching crutch.
Purposed to make sure you get ALL channels.
Longwire V itself, picks up plenty of signal.

But you gotta get some crazy random impedance
down a 75ohm cable from the attic. A passive balun
alone isn't going to cut it for any random Z to 75...
An active device wil have flatter impedance out.

Receiving antenna don't need impedance matching
except to drive a transmission line. If the amp is right
there, mostly what matters is signal to noise ratio.

Popular in US? I'm the only one making that I know of.
I figure if the Professor can make a radio from a coconut,
I can darn sure make a non-resonant antenna out of
some bamboo and scraps of wire.

Anyone can bend a coat hanger and get some channels.
Every channel with nothing resonant to tune: DIY magic.
Its still directional, if not tunable, for good signal to noise.

If you got too strong signal, could use an attenuator in
place of the amp. Would still have (lossy resistive) effect
of terminating the head end of the cable better than the
antenna alone. You want the channels to all come out the
other end without standing wave complications.

You don't want the cable to become a resonant stub that
tunes the antenna so its not picking up all channels.

Last edited by kenpeter; 13th December 2012 at 04:41 AM.
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Old 13th December 2012, 04:47 AM   #14
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Location: Dallas
Directional is important cause it cuts out reflections
off buildings from unintended angles. Those can be
confusing time delayed copies of the intended signal.

At the same frequency and similar strength, you can't
easily "tune" a ghost reflection out after your antenna
has accepted it.

You worst "noise" in "signal to noise" is usually this...

Last edited by kenpeter; 13th December 2012 at 04:52 AM.
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Old 13th December 2012, 05:00 AM   #15
msj965 is offline msj965  United States
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Default DIY HDTV ANTENNA!

I just make my own Hdtv antenna from the same plan of the diy hanger antenna from the youtube. I use a copper tube instead of the wire , I bought it from home depot.I'm telling you 60 miles from the tv transmitter where Im at it's still crystal clear baby! and I get more channels that I didnt know. I'm getting 45 local channels with out a drop out.
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Old 13th December 2012, 04:20 PM   #16
DF96 is offline DF96  England
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The Vee antenna will probably have a fairly high impedance so a 2:1 or 3:1 transformer might match it (roughly) to coax downlead in a strong signal area. Not too easy at UHF though. I have heard of this antenna being used for Band2 FM in the US.

For UHF digital TV here I have a log-periodic in the loft for the main TV set. For a small TV in the kitchen I made a simple X antenna mounted on a wooden frame - somewhere between a bowtie and a (horizontal) skeleton biconical - it sits on top of a kitchen cupboard. I get a good TV signal so it is fine except when people move around!
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Old 13th December 2012, 05:02 PM   #17
Bare is offline Bare  Canada
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Location: vancouver
Have a diy 'designed to needs' antenna system with a rotator and requisite converter.
But in truth it works at it's best when in line of sight with the regional repeater source.
There are TV antenna Forums for this... where All the help, morale , design, and tweeking needed are readily available.
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