End fed wire antennas can work very well under many circumstances. They have some disadvantages, but with careful installation, they can work well and be particularly versatile offering multi-band operation.
That being so, is an end fed antenna directional?
EndFedz states that a sloper will be directional toward the bottom of the antenna. 3. A sloper, as you might guess, is in between a horizontal and a vertical. It can have another advantage though in that it will be somewhat directional- towards the direction of the bottom of the antenna.
In every case, what is an end fed antenna? As the name suggests, an "end-fed" antenna is just that: the radiating element is fed at one of its ends, instead of somewhere in-between its two ends (i.e., center-fed like a standard dipole, or off-center-fed). A special case of this, is the End-Fed Half-Wave (EFHW) antenna.
In short, what is the best wire antenna for HF?
The most popular HF antenna for hams with trees to use as antenna supports is the dipole. A reduced-size 80-meter antenna designed for small lots, portable use, and a fine companion for QRP or the Warbler PSK31 Transceiver .
Does a dipole antenna have to be straight?
Dipole antennas need not be installed in a horizontal straight line. They are generally tolerant of bending, sloping or drooping as required by the antenna site. Remember, however, that dipole antennas are RF conductors. ... (So does the coax shield, unless it is routed at 90° from the antenna.)
BESTSELLER NO. 1 in 2021
CHA EMCOMM III PORTABLE
1 X CHA EMCOMM III matching box
1 X 73' Copper Clad KEVLAR Wire (-70°C to 150°C) (Radiator)
1 X 25' Copper Clad KEVLAR Wire (-70°C to 150°C) (Counterpoise)
10M to 160M
BESTSELLER NO. 2 in 2021
CHA EMCOMM II
1 X CHA EMCOMM II matching box
1 X 60’ Copper Clad KEVLAR PTFE (Teflon) (-70°C to 150°C)
6M to 160M
BESTSELLER NO. 3 in 2021
Portable No Tune End Fed Half Wave Antenna Assembly
The single-band 80m-10m end-feed half-wave linear antenna provides the antenna. It is designed as a highly portable wired antenna that can be easily set as an inverted V-shaped, horizontal, tilted, or vertical radiator (at higher frequencies).
Your feeder is inherently balanced, so no separate feeder is required. The high-impedance half-wave line is matched to your 50-ohm feed point through an integrated impedance-matching toroidal transformer with a rated power of 10 watts.
Use a high-voltage capacitor on the primary of the transformer with a specific radiator length to further expand and reduce the SWR within the range of 80m-10m.
It is designed to be used without the use of a tuner, and after optimizing the driven element, SWR ≤ 1.2 for any part of the frequency band.
Package Included: 1 x Portable No Tune End Fed Half Wave Antenna
BESTSELLER NO. 4 in 2021
Super Antenna MS135 SuperWire Stealth Bulk 135 feet Wire #18 Stranded ham Radio Amateur PTFE
THIS IS: The model MS135 SuperWire by Super Antenna. Designed for ham radio portable antennas, ground radials, SDR, and SWL.
LENGTH: 135 feet (41 meters long) , Bulk roll hank of wire without spool. Excellent for crimping or soldering.
HANDLING: Highly flexible and slippery outer jacket surface tangle resistant in the field for portable use. SuperWire by Super Antenna is excellent for making your own portable antennas and radial sets. WEIGHT: Total 12 ounces.
BESTSELLER NO. 5 in 2021
Radiowavz DX80PL PROline Multi Band (80/40/20/10M) Off Center Fed Dipole Antenna 1500W SSB 800W CW
The RadioWavz DX (OCF) Windom is a off center fed (OCF) dipole antenna that exhibits outstanding performance on multiple bands typically with out a tuner.
Band Width: 80M,40m,20m,10m
Antenna Width: 136ft. end to end 14awg. UV insulated stranded wire.
This is a length of wire that is run from your receiver to a point as far from the radio as possible. The antenna wire can be of any type that you can easily buy. ... Do not worry about keeping the wire straight across the room. Going around is fine and will not harm reception.
You also want the antenna to be at least 1/4 wavelength long for each band you plan to use. For instance, to work 40m be sure the antenna is at least 10m or 33' long....Wire Lengths for Various Band Combinations.
You want to test the UnUn so one easy way to do that is to place a 450 non inductive resistor across the output of the UnUn and an antenna analyzer to the input. Now sweep the UnUn. Don't expect to get a perfect 1 to 1 SWR from 6 to 160 meters.
You might not know that the National Electrical Code (NEC) requires every TV antenna to be grounded. Why? TV antennas that aren't or are improperly grounded can lead to house fires from lighting strikes. Improper grounding also can cause lighting to enter you home!
supports at or near the resonant point of your antenna. If you do, break up the wire support with additional insulators, so as to avoid having a resonant length of wire near your antenna. The short answer to the question as to whether or not you can use insulated wire for an antenna is “Yes you can”.
Attic mounted antennas will work just fine and you will receive pretty close to the same results as you would if the antenna was outdoors. Most roofs have asphalt shingles on them, which won't appreciably block RF radiation. If your house has a tin or steel roof, then the attic wouldn't be much of an option.
So the answer is yes, size does matter, but bigger isn't always better. It all depends on what your transmitting and receiving frequencies are. Theoretically, a longer antenna will have a greater range, but it is far more important for optimal radio performance that the length of the antenna matches the frequency.
When mounted horizontally, the radiation peaks at right angles (90°) to the conductor, with nulls in the direction of the dipole. Neglecting electrical inefficiency, the antenna gain is equal to the directive gain, which is 1.5 (1.76 dBi) for a short dipole, increasing to 1.64 (2.15 dBi) for a half-wave dipole.
In which direction does a half-wave dipole antenna radiate the strongest signal? The radio waves emit out along the length of the dipole outward, and is strongest at the middle. There is little to no RF energy coming out the ends of the antenna. An isotropic antenna radiates equally in all directions.
If you use an antenna which is “too long” or “Too short” for the frequency, it will not resonate, HOWEVER if you use an “Antenna tuner” you can usually electrically tune the antenna to cancel out the reactance and make the antenna resonate at the frequency in use.