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 VHF 136-174Mhz Ham Radio + FREE earpiece $55.34 |
|
|
NAGOYA NA-636 BNC Dual band Antenna for Ham Radio $9.04 |
|
|
Kenwood TH-K4AT Wide Band UHF FM Ham Radio Transceiver $153.00 |
|
|
Maldol AS-30 Dual Band 144/430MHz SMA Ham Radio Antenna $15.00 |
|
|
Yaesu FT-270R VHF FM 5W Compact Handheld Ham Radio $102.50 |
|
|
WOUXUN KG-UVD1P Dual Band DTMF Ham Radio FREE USB cable $105.00 |
|
|
Motorola GP380 70cm ham radio UHF HT Police EMS Fire $300.00 |
|
|
Sirio SY 27-4 4 element Beam antenna CB Ham radio $135.00 |
|
|
Dual Band TG-UV 136-174 / 400-470 Mhz + FM Ham radio $88.00 |
|
|
WAWASEE BLACK CAT HAM RADIO POWER SUPPLY MODEL JB 76 BE $36.00 |
|
|
New 13-18v Fatboy 150 Cb Ham Amateur Radio Power Supply $475.00 |
|
|
Bird 43 Wattmeter with PDC-1 PEP Kit Ham or CB radio $289.00 |
|
|
Lot of 12 Monthly Ham Radio Magaiznes for 1971 $9.99 |
|
|
Deltran 1 Henry 26 Ohm Inductor Choke: Ham Radio NEW(2) $15.50 |
|
|
PEDESTAL SWIVEL MOUNT FOR CB & HAM RADIO LARGE NEW $17.99 |
|
|
JACKITE 31 TELESCOPING POLE--HAM RADIO / ACCESSORIES $95.99 |
|
|
Covert Acoustic Tube Earphone for Motorola Ham Radio $0.99 |
|
|
VINTAGE TURNER MICROPHONE ANTENNA CATALOG CB HAM RADIO $21.50 |
|
|
6 pack Antenna Quick disconnect Ham radio HF antenna @ $19.88 |
|
|
SWR / Power METER for Ham Radio 120 - 500 MHz - 150 W $38.50 |
|
|
Kenwood TM-231A -receiver & transmitter Ham Radio $72.01 |
|
|
2 Maxon UHF 2-Way Radios Maxon Handheld Transceiver HAM $20.00 |
|
|
Vacuum Variable Capacitor 5kV 4-100pF HAM RADIO NOS $36.00 |
|
|
Palstar DL2K Dummy Load 30 Mhz for Ham Amateur Radio $169.57 |
|
|
10-80 SOLID BRASS SLINKY HAM RADIO DIPOLE ANTENNA HF DX $49.95 |
|
|
2 MIDLAND 70-2305B Desk Microphone Ham Radio Mic $11.00 |
|
|
Icom F510 VHF Radio Voice/Data Marine,Commercial,Ham. $107.07 |
|
|
Icom F510 VHF Radio Voice/Data Marine,Commercial,Ham. $107.07 |
|
|
Vibroplex Morse Code Key for Amateur Ham Radio $81.00 |
|
|
FIVE JAN 5718 ELECTRON TUBE VALVE NEW BOXED HAM RADIO $1.51 |
|
|
WORKMAN Ham Radio NEW 4 position coax switch new CB % $9.88 |
|
|
WORKMAN Ham Radio NEW 4 position coax switch new CB % $9.88 |
|
|
HOT! 10-80 SUPER SLINKY HF HAM RADIO DX Dipole Antenna $24.95 |
|
|
WORKMAN Ham Radio NEW 4 position coax switch new CB % $9.88 |
|
|
Fells Guide Shortwave Ham Radio Charles Vlahos Scarce $6.99 |
|
|
Ham Radio HF Antenna 10-12-15-17-20 meter CondoBuster $23.50 |
|
|
Cherokee CBS - 1000 10 Meter SSB Ham Radio $100.00 |
|
|
Mouse Pad Mousepad HAM RADIO Amateur Operator Shortwave $5.49 |
|
|
21 FT BELDEN SUPER CB Ham Radio Antenna Coax w/ PL259s $19.99 |
|
|
YAESU VX-8R VX-8 AMATEUR HAM RADIO DATACHART LETTER SZ $10.80 |
|
|
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... |
|
|
Country Ham $2.78 ... |
|
|
Joe Palooka: Original Radio Broadcasts: Soundtrack Spoken Word Lp (1974) 12 Inch, 33rpm, Vinyl LP/RECORD. 1974 USA PRESSING. ORIGINAL.... |
|
|
Ham Radio $9.99 ... |
|
|
Hancock: the Radio Ham [VHS] ... |
|
|
Frequency (New Line Platinum Series) $4.28 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 ... |