Radio Ham
do i need the cb ham radio antenna on the ground?
so i have this cb ham radio antenna and it is not on the ground, it is on the roof of my house. my house is not tall, just a normal regular house. do i need to put the antenna on the pole that is on the ground? and not on the roof? well my antenna is on the pole and its on the roof of the house. why is called ground plane antenna? and why do i need to put the antenna with the pole on the ground?
For a ground plane vertical to work correctly they need to be mounted above a conductive sheet or metal or a radial network.
This metal sheeting is called the 'ground plane'.
If your house roof is made form metal roof sheeting , then this can be used as a ground plane surface , just in the same way it is used in a car antenna installation.
This is not however possible if you wish to raise the antenna base away from the surface of the sheeting , eg , on a pipe mast support above your roof.
If you want to get the antenna up on a pole you MUST replace the ground plane with radials.
Radials are wires connected to the base of the antenna and are approximately 1/4 wavelength long.
Typically they are angled slightly down for impedance matching purposes , which also makes them handy in some applications as guy wires.
Up on a pole you don't have as bad an effect called 'earth losses' . this means that 4 radials may be all that is required to get the antenna to perform well. (but more the merrier)
Now if you mount your antenna at ground level the losses force you to use a considerably more amount of radials.
AM band broadcast stations use 120 radials ..!!!!!
Typically though no appreciable gain can be seen after you get past 20 - 30 or so radials.
The result of using less radials than required is poor radiation efficiency.
4 radials just wont cut it in this situation.
That all means that with a poor radials system ,. you have more wasted power , by comparison to a good radial system.
Another disadvantage of using a ground mounted antenna is signal obstruction due to buildings and trees etc.
Not only will these drop the strength of your incoming signals , but they also absorb your outgoing power, which means again , less overall effectiveness from the antenna.
Ground mounted verticals can work well 'ONLY' , if they are mounted in the clear and 'ONLY' when used against a suitable ground system.
Saying this , the fact is , most attempts of ground mounted verticals for CB fall far short of the requirements and often perform poorly.
|
|
Puxing PX-328 UHF 400-470Mhz Ham radio + Free Earpiece $30.80 |
|
|
Puxing PX-328 136-174Mhz VHF Ham radio PX328 + Earpiece $31.99 |
|
|
ECC84 RFT Neuhaus tube valve Radio receiver tuner Ham 2 $13.00 |
|
|
6AK6 Raytheon tube 2 pcs for Tuner Receiver Radio HAM $14.00 |
|
|
EF92 Philips 2pcs tube Tuner Receiver Radio HAM 6CQ6 $14.00 |
|
|
6AG5 GE 2pcs tube Tuner Receiver Radio HAM EF96 $14.00 |
|
|
Veritas Mic Ham Radio Mic $2.99 |
|
|
2pcs Used TELEFUNKEN 6360 = QQE03/12 Tube HAM Radio $14.00 |
|
|
PUXING PX-2R UHF 400-470Mhz Smallest 2-way Ham Radio $39.20 |
|
|
LC Tank Capacitor + Coil. Lot of 2 HAM Radio $9.99 |
|
|
10-160 meter BRASS Slinky HF Ham Radio Dipole Antenna $79.95 |
|
|
10-80 SOLID BRASS SLINKY HAM RADIO DIPOLE ANTENNA HF DX $49.95 |
|
|
PERSONALIZED CALL SIGN HAM AMATEUR RADIO STICKER DECAL $6.99 |
|
|
PERSONALIZED HAM AMATEUR RADIO WINDOW DECAL ~~ NICE ~~ $4.99 |
|
|
Ameritron al-811, Ham Radio, Amplifier, Ameritron $360.00 |
|
|
Cobra Power Mic,CB/Ham Radio by Cobra CA-76 $7.50 |
|
|
Ham Radio / amateur Radio antenna /Telescoping Mast $45.99 |
|
|
10 Lot SO-239 UHF Female TO BNC Male Adapters Ham Radio $15.90 |
|
|
ASTATIC ECHOMAX 2000 CB OR HAM RADIO MICROPHONE ( MINT) $180.00 |
|
|
ICOM IC-746 PRO AMATEUR HAM RADIO DATACHART 8 1/2 x 11 $9.80 |
|
|
Radio Amatuer's Handbook Great Tube Info, Audio & Ham $8.00 |
|
|
Ham Radio EXTRA CLASS 738 test questons on 7 cd's NEW % $19.05 |
|
|
HAM RADIO POWER SUPPLY $75.00 |
|
|
Metal BUDDY HOOK Mic Holder Hanger for CB / Ham Radio $1.00 |
|
|
HAM Radio Amateur's General Class Audio FCC Prep Course $4.99 |
|
|
Antenna 3 element - Ham Radio $22.72 |
|
|
85' SILVER Slinky Shortwave Radio Antenna HF AM HAM ++ $12.95 |
|
|
YAESU FT-857D 10 6 2 440 meters HF VHF UHF HAM Radio $580.00 |
|
|
Vintage CB HAM Radio Recorder Mics for parts or repair $9.99 |
|
|
Uniden Bearcat BC550A Turbo Scanner Ham Radio $30.00 |
|
|
NEW UTC DUAL TIME CLOCK 14 GMT WHITE/BLACK HAM RADIO $29.99 |
|
|
NEW UTC DUAL TIME CLOCK 14 GMT BLACK/WHITE HAM RADIO $29.99 |
|
|
NEW HAM RADIO SWL 24 HR WORLD CLOCK 16" BRASS UTC ZULU $48.99 |
|
|
AVIONICS UTC DUAL TIME CLOCK 10" GMT W/B HAM RADIO NEW $25.99 |
|
|
AVIONICS UTC DUAL TIME CLOCK 10" GMT B/W HAM RADIO NEW $25.99 |
|
|
NEW AVIONICS UTC DUAL TIME CLOCK 14 GMT BLACK HAM RADIO $29.99 |
|
|
NEW AVIONICS UTC DUAL TIME CLOCK 14 GMT WHITE HAM RADIO $29.99 |
|
|
AVIONICS UTC DUAL TIME CLOCK 10" GMT WHIT HAM RADIO NEW $25.99 |
|
|
AVIONICS UTC DUAL TIME CLOCK 10" GMT BK HAM RADIO NEW $25.99 |
|
|
NEW HAM RADIO SWL 24 HR WORLD CLOCK 14" BRASS UTC ZULU $38.99 |
|
|
Amateur Radio Water Proof Log Book ARLB3 $8.50 Waterproof synthetic paper accepts pencil, non-water soluble inks, normal ball point pens and permanent markers giving you a tear-resistant, waterproof record of all your contacts. Stains wipe off with a damp cloth. Ideal for harsh field conditions as well as regular Ham Shack use. Takes extreme variations in temperature and humidity in stride. Great for Amateur Radio Maritime use. The sturdy 3 by... |
|
|
Amateur Radio Water Proof Log Book ARLB5 $8.50 Waterproof synthetic paper accepts pencil, non-water soluble inks, normal ball point pens and permanent markers giving you a tear-resistant, waterproof record of all your contacts. Stains wipe off with a damp cloth. Ideal for harsh field conditions as well as regular Ham Shack use. Takes extreme variations in temperature and humidity in stride. Great for Amateur Radio Maritime use. The sturdy 3 by... |
|
|
HAM OPERATOR PARKING sign * street radio $19.95 HAM OPERATOR PARKING ONLY sign. A BRAND NEW SIGN!! Made of thick (0.040in.) aluminum and tough vinyl lettering and graphics this sign is 12in. wide and 18in. tall just like official parking signs. Made to last for years outdoors the sign is nice enough to display indoors. Comes with two holes pre-punched for easy installation, corners are rounded. Buyer to pay $7.00 shipping anywhere in the USA, o... |
|
|
Hancock: the Radio Ham [VHS] ... |
|
|
Frequency (New Line Platinum Series) $4.21 A once-in-a-lifetime phenomenon of nature allows a young police officer to reach back into time to save the life of his long dead father. But changing the past leads to a string of brutal serial homicides. Now, the father and son must race against time to prevent the killer from claiming his next victim.... |
|
|
Frasier - The Premiere Episodes (Season One, Episodes 1-6) $2.75 Studio: Paramount Home Video Release Date: 02/05/2008... |
|
|
Ditto $19.50 ... |
|
|
TRENDnet LMR400 N-Type Male to N-Type Female Weatherproof Cable (12M, 39.4ft.) TEW-L412 $47.95 The LMR400 N-Type Male to N-Type Female cable extends your wireless Antenna up to 12 meters to provide optimal placement for your antenna outdoors. Connect business networks from building to building wirelessly or provide wireless Internet access for hot spot applications! This cable makes wireless communication possible by providing low loss communication between your access point and antenna.... |
|
|
100' EXTENSION ULTRA LOW LOSS COAX CABLE $97.00 Wilson 952300 100' Ultra Low Loss Coax Cable. This 100 ft cable is LMR-400 type with N Male connectors. The loss over the whole cable run is -4dB. LMR-400 is a very low-loss 50 ohm cable compatible with all the amplifiers on our site (except the SignalBoost DT). When used correctly, the LMR-400 cable can be used for cable runs in excessive of 100ft. The cable is light, flexible and weatherproof... |
|
|
10' EXTENSION FOR WILSON 400 (ULTRA LOW LOSS) $21.95 ... |