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HF Ham Radio antennas for apartments and methods of shortening antennas

This multiband wire antenna it is an off centre fed dipole, with 10 feet of vertical radiator, needs no tuner on 40m, 20m and 10m and works fine on all bands above 40m with a tuner, and even below 40m on 60m, and 80m.

2m SSB/CW-12.5 Ohm Yagis with extrem high gain and small bandwidth. These Yagis were constructed as ultra-light, portable Yagis with extrem high gain. They have small bandwidth and are working from 144,0-144,8MHz with good SWR.

An F150 and Yaesu FT-857, ATAS-120 No-drill Install

The KJ5VW 20 Meter Mini Yagi by Gary R. Hanson, Austin, Texas

KD6WD introduce moxon rectangles, and in particular explains how he built a moxon antenna for 15 17 and 20 meters band with excellent pictures

Effective HF Mobile Antennas Keith WB2VUO, explains difficulties on gaining antennas efficiency on lower bands with mobile antennas.

Nasa MSFC predictions on the behavior of current sunspot cycle.

Lookup callsign histories & applications, available Amateur Extra callsigns, vanity callsign predictions, and more. Updated from FCC data several times a day.

a Javascript for calculating the lengths of tubing to be used for the construction of a Super J-Pole.

Product review & short takes columns from QST magazine

Selecting an appropriate antenna system for shortwave broadcasting involves evaluating various types based on performance, cost, and operational parameters. This resource details the critical specifications for broadcast antennas, including average and peak power ratings, directivity, takeoff angle (TOA), horizontal beamwidth, and gain, emphasizing that a 100-kW transmitter requires an antenna rated for 150 kW average and 400 kW peak. It clarifies that low TOA signals travel thousands of kilometers, while high TOA is for local coverage, and nearly all modern shortwave broadcast antennas are horizontally polarized. The article explores specific antenna types, such as Log-Periodic Antennas (LPAs), which offer wide frequency ranges (e.g., 2-30 MHz) and directional patterns with 11 dBi gain, costing from $20K to over $100K for multi-curtain versions. Dipole arrays, also known as curtain antennas, are prevalent in international broadcasting, featuring steerable beams (±15° and ±30°) and mode-switching capabilities to alter TOA, with high/low pairs costing over $1 million. Fan dipoles are noted for omnidirectional patterns, smaller size, and lower cost for low-power applications, while rhombics, though simple, require resistive termination and incur several dB of I2R losses. Balun considerations are crucial, as most communications baluns are not rated for the higher average and peak powers of AM broadcast transmitters. Modern shortwave antennas utilize durable materials like Alumoweld wire rope for radiators and support elements, avoiding copper, fiberglass, or materials prone to stretching or deterioration. Feeder systems for high-power stations often require tapered-line baluns to convert 50-ohm unbalanced power to 300-ohm balanced for connection to the antenna.

FT2 is an innovative digital mode for amateur radio, developed by IU8LMC with support from ARI Caserta. It utilizes the same codec as FT8 and FT4 but compresses the transmission cycle to just 3.8 seconds, allowing for a complete QSO in as little as 11 seconds. This remarkable speed enables operators to achieve approximately 240 QSOs per hour, making it particularly advantageous for contests and DXpeditions. The FT2 protocol has been rigorously tested on-air, with successful QSOs verified down to -12 dB SNR on both 40m and 80m bands. The mode's efficiency and speed are a significant advancement in digital communications, providing a new tool for amateur radio operators looking to maximize their contact rates. As an experimental release, the software is subject to updates, ensuring continuous improvement and adaptation to user feedback.

K6SGH hamloop antenna for 15 meters band

A 3 element DELTA LOOP on 20 meter, 4 on 15 and 5 on 10: my new beam (Just some good ideas)

This web player allow to listen to the Anne Arundel County Police and Fire Live Scanner Radio Feed

ARRL WAS Map, Map of USA call districts by ARRL and edited by AA70A

A 13,8v/5Amp 78H05 based power supply for portable use. In this example used to power up a Yaesu FT-817

This is a site for Kingsport,Tenn police and 911 a good site to check out. You must register at live365 but it is worth it.

based on the famous Curtis family of morse keyer chips and has a proven record of dependability.

A full wave 2-meter VHF omnidirectional antenna by ON6MU

MM Antenna Analyzer by JE3HHT Makoto Mori based on the moment method, which was introduced in MININEC. Download MMANA Free from this page that offer download of basic version and link to the MMANA pro version.

Shakespeare Composites & Electronics Division manufactures a complete line of unmatched CB, CB marine, and military antennas for a veriety of applications.

Multi-band centre-fed antenna capable of very efficient operation on all HF bands, specifically designed with dimensions which allow it to be installed in gardens and other open spaces which accommodate a reasonably-straight run of 31.1m (102 ft) for the flat-top standard model.

A.R.C. The National Publication For Buyers And Sellers Of Old Radios And Related Items--Published Monthly

Electronic World atlas for radio amateurs. DXCC and province prefixes, CQ and ITU Zones in the rectangular and azimuthal projections, continuous zoom and scrolling, Gray Line, city and island index, unique hierarchical prefix database. COM/OLE Automation for easy integration with 3-rd party programs.

This project started as a result of renewed interest in 40 meters coupled with the desire for an antenna system that would be more effective than the simple dipole.

Facilitates efficient logging of amateur radio contacts, offering a robust solution for hams managing their station activities. The software integrates _CAT control_ capabilities, allowing direct interfacing with popular transceivers from manufacturers like Yaesu, Icom, and Kenwood. This feature streamlines the logging process by automatically capturing frequency, mode, and other QSO details directly from the radio, reducing manual entry errors and improving operational efficiency during contests or DXing. _HAM-LCT_ includes a comprehensive database, enabling users to store and retrieve contact information, QSL data, and other relevant details for each QSO. The program supports various operating modes and provides tools for searching and filtering log entries, which is beneficial for award tracking and station analysis. Its design focuses on providing a user-friendly interface for everyday logging tasks. While the original author, _HB9CQV_, has discontinued development of HAM-LCT in favor of a newer logging application, this version remains available as a functional freeware option for Windows users seeking a dedicated logbook with integrated rig control.

Vertical antennas for all HF bands, expecially 80 40 20 meters bands

Three eh antenna plans for 20 40 meters bands.

Drawings of shortened antenna for indoor usage, using short pvc tubes for 2 , 20 and 40 MHz by f1rfm

This project uses a widely available IRF510 MOSFET, work on HF 80, 40, 30, 20 and 17 meter bands

A new tronics company, antenna maker, HF vertical antennas, vhf antennas, cb antennas

The Radio Attic serves as a dedicated online marketplace for **antique radios**, offering a platform for enthusiasts to buy and sell vintage communication equipment. The site features classified advertisements, each displaying full-color photographs of the radio, a detailed description, and a direct link to the seller's email address. This structure facilitates direct communication between buyers and sellers, as transactions are handled independently, not by the webmaster. Listings are categorized by style, manufacturer, and year of manufacture, including models from Admiral, Airline, Atwater Kent, Crosley, Emerson, Fada, General Electric, Philco, RCA, Silvertone, and Zenith. The platform also tracks new additions, with 49 radios and 6 books added in the past 30 days, and highlights recently sold items, totaling 157 radios this year. Beyond sales, the site provides resources like a price guide and information on upcoming swap meets, such as the Southeastern Antique Radio Society's Spring Swap Meet in Forsyth County.

Dipole, Yagi, Vertical, Cubic quad, Log periodic, J-pole, coil, and transmission line design package for the Macintosh

GAP produces HF vertical antennas

Perfect ground vs. poor ground. What is the difference? How does the ground influence the DX-gain?

This projects was developed as a result of experiments to become QRV on 80 meters, again, using the little balcony by SM0VPO

Interesting article on mobile antennas by Cebik. . The article offers advice for setting up and operating mobile antennas for ham radio use. It emphasizes the lossy nature of mobile-in-motion antennas but encourages users to rise to the challenge. Steps include safeguarding car electronics, choosing proper cabling, and carefully selecting and mounting antennas. It highlights potential issues like roof mounting, trunk lip grounding, and side-mounting for trucks. For stationary operation, options like dipoles or beams are explored, with safety tips for masts and guying systems. Lastly, it stresses safety, suggesting stopping the vehicle to operate whenever possible

Design and build your own Hf thru Vhf antennas.Contains pictures, plans, parts list of very popular ham antennas along with experimental types.

A new and simple method for tuning traps. You need 2-3Watt of your TRX and two homemade coupling coils by DK7ZB

So you want to build a Beverage Antenna. This article offers insights on building a two-wire Beverage antenna for better reception. Key points include using long wire (at least a wavelength, ideally two), keeping it straight and away from vertical conductors, and sloping ends for noise reduction. The author recommends copper clad wire and mentions transformer design considerations for later discussion.

Slinky Antenna Basics, clandestine dipole

Choose Iron Powder or Ferrite and calculate required turns

Calculations for determining the wind loading stress on an antenna mast. Link to a spreadsheet for calculating the mast bending stress based on wind speed and antenna cross sectional area.

All copper J-Pole antennas for sale. 6 meter, 2 meter, 222 MHz, 440 MHz, LPFM, Marine, GMRS. Includes a construction plan in pdf format if you wish to build your own antenna.

802.11b WLAN Waveguide Antennas Unidirectional & Omnidirectional. High gain, Simple construction by Trevor Marshall

UHF 3 element portable antenna with gamma match by ON6MU

This project shows how to build a 50-ohm dummy load using non-inductive resistors, oil for heat dissipation, and a simple assembly process. It enables accurate transmitter tuning, testing, and power measurement across LF to UHF bands. The setup allows meter calibration by measuring peak voltage, applying diode drop correction, and calculating RMS voltage and power precisely. Parts are inexpensive and widely available. With proper assembly, this dummy load offers extended service life, accurate readings within 2%, and a reliable alternative to costly commercial wattmeters for amateur radio applications.

Win96 - data management software for the PRO-96 digital trunking scanner