Getting on 160 Meters on a Budget - eHam.net
Mar 26, 2009 · Of course adding radials will improve the performance. Cebik provides modeling data for a 160M vertical with 4, 16 and 64 quarter-wave radials. Quarter-wave 160M vertical 4 radials: -0.72 dBi 16 radials: +0.48 dBi (1.2 dB improvement) 64 radials: +1.14 dBi (a further 0.66 dB improvement) There is no change in the TOA.
10-Meter Dipole with 5 Db Gain - eHam.net
When bent, think of it as a quarter-wave monopole with one radial at various angles. It can be configured at ~75 degrees for general purpose as a slightly directional quarter-wave vertical with mixed polarization; or at ~105 degrees as a bi-directional horizontal quarter-wave beam with 5 dBi forward/rear lobes and 5 dBi side/side attenuation.
A Simple Pull-Up Mono-Band Vertical Dipole Antenna Design / …
ZL4AI 2021-05-16; A Simple Pull-Up Mono-Band Vertical Dipole Antenna Design / 4NEC2 Tutorial; This is a very interesting article and you have developed a high performance vertical which shows -1.41 dBi out put at 5 degrees you require for DX.
ARRL EFHW 40m, 20m, 15m and 10m antenna kit, made by HFkits
Oct 15, 2020 · ARRL has partnered with HF Kits to bring you this easy-to-build four-band antenna kit: an end-fed half-wave (EFHW) antenna. Unlike the dipole antenna, which is comprised of two quarter-wavelength wires and fed at its center, the EFHW is a half-wavelength antenna with the coaxial cable for your transceiver attached at one end.
The 20-Meter J-Pole - eHam.net
The J-Pole antenna is an omnidirectional antenna that can be used for base, mobile and field day stations. It does not need a ground plane, radials or a complicated matching system. THEORY The J-Pole antenna consists of a half-wavelength radiator fed by a quarter-wave matching stub. Effectively, the antenna is an end fed dipole.
Covid-19 Dual Band 2m/70cm Antenna Build - eHam.net
Jun 24, 2020 · The antenna arrived at is shown below, and looks very similar to a standard 2m quarter wave ground plane except radial and radiator lengths and radial angle. However, the dimensions are sub optimal for min SWR for 145MHz but enable a 3/2 wavelength antenna on 70cm as we will see. Figure 1: “Compromise 2m/70cm Dual Band Antenna”
Reviews For: Alpha Delta DX-A - eHam.net
160-80-40 Meter 1/4-wave Twin Sloper - A top low frequency DX antenna. Combines the tremendous DX firepower of the 1/4-wave sloper with the wide bandwidth of the 1/2-wave dipole. One leg is 67 ft., the other 55 ft. Installs like an Inverted-V with ground return accomplished thru tower or down-lead: Product is in production
160 Meter Longwire for Limited Spaces - eHam.net
Pete--Thanks for posting this antenna idea. I use an inverted L antenna for 160, fed with good coax about 60' long to an RF choke at the base; my 1/4 wave antenna is only 40' high sloping to 32', and I have 50+ crooked radials of varying length. My SWR is about 2:1 to 3.5:1, which I adjust with a tuner in the shack.
Angle of Radiation - What is it? - eHam.net
This antenna rocked compared to the delta loop at sixty feet. In A/B tests within 300 miles, the cloudwarmer was generally 5-10db louder, of course unscientific. If ya wanna kick butt up for your local coffee klatch, a dipole anywhere from a quarter wave to a half wave in the air will do great.
Antennas for QRP - eHam.net
K4UUG 2007-01-03; Antennas for QRP; The most efficient antenna that I use is one dipole that is cut for the freq I am operating on.I ran the HF MARS net here for 6 months with a 5 watt YAESU FT 817.I used a wire dipoleantenna cut for 4.000 mhz a 1:1 balun and 100' of RG 213 Coax.I had no problem checking into nets in AZ,TX,MO,AL,GA,TN,NC,SC,FL,MS,VA,IL,OH.Just 5 watts