television antenna

8/17/2019 Television Antenna

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Outdoor Antennas

Yagi Antennas

The Yagi antenna is credited to Hidetsugu Yagi, a Japanese physicist who pioneered the field of

directive antennas. Designed to improve the gain of the antenna concentrated in one direction,

Yagi antennas use elements called directors and reflectors. They provide a very high gain with

a very narrow bandwidth. In fact, the frequency bandwidth is inversely proportional to

antenna gain.

To increase the frequency bandwidth of Yagi style antennas, we increase the diameter of the

antenna conductors. The greater the conductor diameter, the wider the band. This increased

conductor diameter also has a second benefit in that it increases the physical strength of the

antenna.

t ntennas Direct, we also incorporate corner reflectors into our designs to improve the

power gain, directivity, and impedence of the antenna. These reflectors have a very high front

to bac! pic!up ratio that also reduces interference from stations to the rear of the antenna.

Outdoor Antennas

T here are many different types of outdoor antennas available in a wide price range. The typeselected is determined primarily by the geographic location of the receiving TV.

Television signals are strongest when the TV station's broadcastingantenna and the home receiving antenna are in line-of-sight. If the line-of-sight is blocked or weakened by hills, buildings or trees, the signal,

likewise will be weakened or lost. The signal will also get weaker as ittravels farther from the broadcast antenna.

"ain" is the measure of an antenna's sensitivity-- and its ability to pick upsignals. It is measured in decibels !d#. $s you move farther away from theTV stations broadcasting antennas, the si%e of the TV antenna that you willneed will increase. &ower uality antennas that claim to be for fringereception areas often have a long boom, but do not have as manyelements as higher uality antennas do. These elements are the actual

4-bay bowtie UHF TV

antenna (8-13dB gain) for suburban to fringe

reception areas wit

!ediu! signa"#


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part of the antenna that capture the incoming signal. The more elements that an antenna has, themore gain it will have, and the more signal it can receive.

ain can also vary from channel to channel on the same antenna and it can also vary betweendifferent antennas. (or e)ample, an antenna's gain at *hannel + may be d, but the gain atchannel / may be +0d. These are 1ust a few reasons why it is very important to compare

antenna specifications and get the right antenna for the area that you live in.

2here buildings or other obstructions cause "ghosts", an antenna with good directivity isrecommended. 3irectivity is the ability to receive only those signals at which an antenna ispointed. 4ighly directive antennas have narrow receiving angles !measured in degrees# and high"front to back ratios". These ratios represent the antennas ability to receive signals from the frontof the antenna compared to receiving the same signals from the back of the antenna. The higherthe front-to-back ratio is on an antenna, the more it will try to re1ect any unwanted signals from therear of the antenna. This is especially helpful in areas where ad1acent channel interference is aproblem or where there are two channels on the same freuency and only one channel isdesired. This is called "co-channel interference".

If already have good TV reception on the V4( channels, it will probably be less e)pensive to add

a good uality 54( antenna on the same mounting mast. The separate 54( antenna also willpermit pointing to V4( and 54( TV stations which may have their broadcast antennas in differentdirections from your location.

Pictured is the Winegard HD-9095P UHF Yagi TV antenna withcorner refector !"#-"$d% gain& for fringe to dee'est fringerece'tion areas with wea( signa)

If all television signals are coming from the same direction, both V4(and 54( reception can be improved. *hoose an antenna according tothe distance to the most distant 54( station for which reception isdesired by installing an "all-channel" combination antenna. This is themost common type of outdoor TV antenna.

Pictured is a Winegard HD-*0+#P VHF,UHF A.hanne TV Antenna

There are several good uality "all channel" V4(654( TVantennas available. If the 54( stations to be received arelocated in different directions from your house !more than07 degrees apart#8

• 9ither use an antenna rotator

• :r combine two antennas together using either a mast mounted combiner or a

backwards ;-way splitter .

91XG Uni-Directional Antenna

This high performance "H# antenna has a higher gain and a smaller beam angle thanconventional Yagi antennas. The reflector grids create an improved front to bac! ratio with

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shorter construction while the $% elements truly ma!e it one of the highest gain "H# antennasavailable.

lthough the $%&' is one of the highest gain "H# antennas made, it is also very directional. If you live more than () miles from the transmitters, you must get as much elevation on theantenna as possible. *ven with its great gain, it cannot pic! up signals bloc!ed by thecurvature of the earth.

• +ideband coverage of "H#

channels %-($

• High protection, anti-corrosion,

gold anodied aluminumconstruction

• /eflector grids manufactured

from welded, hot dipped, inc-plated steel with plastic coating

• 0ow wind load

• 1nap-loc! quic! assembly

•Inclinable mast clamp forhoriontal or vertical installation

• High performance, integral 234

balun for true signal matching

• #ront to bac! ratio5 67 d4

• High gain across entire "H#

band 8"H# channels %-($9

• Max Gain 16.7 dB

• Dimensions 66: H ; 6): + ; $


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• Impedance ?= ohm

• +or!s up to ?) miles or more

from transmitters

• @ery fle;ible aiming

characteristics

• +eatherproof construction



• Max Gain 1.! dB

• Dimensions 6$: H ; 6: + ; :

Deep

• +eight5 %) pounds

• Lifetime Warranty

Assembly Instructions Price: $99.

%&XG Uni-Directional Antenna

This uni-directional, Yagi style antenna is intended for long range applications ranging from%=-() miles from the transmitters. Its < elements create a powerful %=.? d4 gain with a frontto bac! ratio of 6?d4.

• /ange %=-() miles

• "ni-directional Yagi style design

• #ront to bac! ratio5 6?d4



• Max Gain 1.7 dB

• Dimensions %$: H ; %7: + ; (6:

Deep

• +eight5 = lbs.

• Lifetime Warranty

Assembly Instructions Price: $9.

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%'XG

The efficient placement of elements provides for an e;ceptional %.6 d4 gain with a shortboom. This HD television antenna features durable all weather construction that does great inharsh weather conditions.

• &' 8(xtre)e Gain* o+ 1%.' dB

• ll weather construction of

anodied aluminum

• Designed to withstand high

winds

• Integrated all weather ohm

converter included

• *;cellent for receiving HDT@

signals from %) to =) miles fromtransmitter.

• 1trong gain across entire "H#

band 8channels %-($9

• 0ight weight ma!es mounting

easy

• Dimensions %=: H ; %$: + ;


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• +eight5 .= pounds

• Lifetime Warranty Price: $&9.

P07 Pict"re 0ra)e Antenna

#or those loo!ing for a powerful but discreet digital antenna, the 2#? is the answer. This

antenna utilies powerful "H# elements hidden in an 7: ; %): frame. It is ideal for strong

signal areas 8usually within %= miles of the transmitter9 where multi-path is an issue.

• 6. DB Gain

• +all hung or table mount

• 0andscape orientation

• Durable molded design

• Includes ?= ohm /'( coa;ial

cable fitted with #-typeconnector

• Dimensions appro;5 $: H ; %%:

+ ; %: Deep to hold 7 ; %)2hoto.

• +eight5 %.= pounds

Price: $'9.
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