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This article contains the measurements for building a full wave loop using wire and length of 1/4 Wave Coax Matching Transformer

This Duoband-Yagi has a boom of 3.60 m and 3 elements for 10 m 4 elements for 6 m and one feedpoint with 50 Ohm

Presentation by AC8GY on classic G5RV Antennas and other horizontal dipoles, the popular G5RV, ZS6BKW, dipole fan, Alpha-Delta DX-CC and a trap dipole are modeled in EZNEC and compared.

SWR meter for 1 to 1300 MHz project

conversion of low band VHF AWA RT-85 transceiver down to 6 metres.

50 MHz IARU Region 1 bandplan

A lightweight portable vertical antenna for 40m

A home made dipole antenna for 10m, 6m, 4m bands made with two sections of 450 and 300 Ohm ladder lines, cut to achieve acceptable SWRs on all bands

A three band short Vee antenna is feasible with two legs per side on a dipole. 10-15-20 meters by W8HDU

The KP3AV Systems website offers a detailed listing of amateur radio repeaters across Puerto Rico, including operational frequencies and tones for VHF and UHF bands. It features sections dedicated to digital modes like DMR and C4FM, as well as information on FRS, GMRS, and MURS. The resource also includes articles on emergency communications protocols and provides access to Spanish-language manuals for various radio equipment. Recent content covers the new open-source FT2 mode for WSJT-X Improved, upcoming 60-meter band frequency allocations and power restrictions effective February 13, 2026, and discussions on 2-meter contacts with Desecheo Island from Puerto Rico. The site also presents U.S. amateur radio band plans and highlights local contesters like Manuel WP4TZ, offering practical insights into portable operations and contest participation.

A 4-Band vertical antenna that needs NO tuner, NO traps. Implement an LC matched on 4 bands with relay switching.

The X80 is a commercial version of a so-called Rybakov vertical antenna.

A vertical antenna for Six Meters band

The ZS6BKW multi-band antenna, an optimized variant of the classic G5RV, is presented with detailed construction and tuning instructions. This resource outlines the antenna's design principles, which were developed by _Brian Austin (G0GSF)_ using computer programs and Smith charts to achieve optimal dimensions. It provides specific guidance on calculating and adjusting the lengths of the radiators (L1) and the matching ladder line (L2), emphasizing the critical role of velocity factor (VF) in achieving resonance. The article includes a step-by-step procedure for empirically determining the VF of ladder line using an antenna analyzer, ensuring accurate physical lengths for the matching section. It details the tuning process for the radiators, offering practical tips for incremental adjustments to achieve the best SWR curve. The resource presents SWR measurement results obtained with an _AIM-4170C_ analyzer across multiple bands, alongside predicted SWR graphs from an AutoEZ model. It confirms successful contacts on 80, 40, 20, and 17 meters, including a **17-meter DX contact** to Italy. EZNEC and AutoEZ models for the ZS6BKW antenna, covering 80 through 6 meters, are provided for download, allowing further analysis and customization. The document specifies component details, such as the use of Wireman 554 ladder line and #14 AWG THHN copper wire, and discusses the antenna's performance characteristics, noting high SWR on 15 and 30 meters but successful tuning on 6 and 80 meters with an external tuner.

A comparison of multiband dipoles, including jumpered dipole versus fan dipole antennas, dipole fed by ladder line, resonant dipoles antennas. ARRL lab notes

A bycicle ham radio station setup, with full band coverage

VHF UHF half wave flower pot antenna project by VK2ZOI

An HexBeam antenna project, a 2 full elements on six bands

Stub sketch notes. Attenuation coax stub schematics

Demonstrates the operational status and reception reports for the SK6RUD/SA6RR QRPP beacons, which transmit on 478.9 kHz, 1995 kHz, 10.131 MHz, and 40.673 MHz. These beacons utilize extremely low power, with the 630-meter beacon operating at approximately 0.1 watt ERP into an L-antenna, showcasing the potential for long-distance contacts under favorable propagation conditions. The site details the specific frequencies and antenna types employed, such as a vertical at 500 kHz and a 1/4 vertical for higher bands. The resource compiles over 10,530 reception reports from amateur radio operators worldwide, logging details such as date, time, band, RST signal report, locator, distance, and receiver setup. Notable long-distance reports include a 500 kHz reception by AA1A-Dave from 5832 km in 2008 and a 10.133 MHz reception by ZL2FT-Jason from 17680 km in 2010, illustrating the global reach of these low-power transmissions. Each log entry provides specific equipment used by the reporting station, including transceivers like the Yaesu FT817, ICOM IC-7300, and various antenna configurations such as coaxial mag loops, inverted Ls, and end-fed wires. The primary objective of the SK6RUD beacons is to challenge conventional notions of power requirements for effective two-way communication, proving that contacts over significant distances are achievable with minimal output. The site also includes a submission form for new reception reports, fostering community engagement and continuous data collection on propagation phenomena across different bands. The detailed logs offer practical insights into real-world propagation characteristics and the efficacy of QRPP operations.

An homebrew project for a 4 elements yagi monoband antenna for the 10 meters by 9M2MSO

Crossband repeat operations on the Wouxun KG-UV8D dual band multifunctional two-way radio. This demo explains differences in the cross band repeater functions of the KG-UV8D.

Picture taken from official manual with notes on tuning stubs for each band

A presentation of a HF multi-band sloper antenna. This antenna project is for low band operations, and antenna presented in this article works on 40 80 and 160 meters band. Article is in Polish.

About the basics of what is a discone antenna for wide band or bandwidth omnidirectional applications

A project that describes a build a multiband wire beam antenna. A 3 band single feed moxon antenna for 20,15,10 meters.

A shortened multiband dipole antenna by PA0FRI in Dutch

Yagi with 5 Elements on 2 m, 8 Elements on 70cm and one Feedpoint by DK7ZB

A post about the construction and measurements of a Resonant Feedline Dipole cut for the 10M band

The main function of the Ugly Balun is to help eliminate rf currents from flowing on the outside of coaxial cable using the principle of choke action.

Third-order Cauer filters can boost performance of multi-transmitter, multi-operator contest stations to the next level. The filters are practical and you don’t need expensive test equipment to align them.

How to homemade a multi-band HF dipole using 100 meter of speaker wire, 2 strandsm including a homebrew 1:1 choke balun

My Top Five Backyard Multi-Band Wire HF Antennas. A selection of the top 5 HF wire antennas for the backyard and for multi-band operation

The broad band hexagonal beam (hexbeam) designed by G3TXQ and built by K4KIO

The AB2RA bowtie 80 meter antenna includes also a 40 meter dipole

Trap-style Inverted-V Antenna for 3.5, 7, 14, 21 & 28 MHz

Random Length Multiband Dipoles can be a good solution for field day operations or outdoor activity, read more at ARRL web site

This antenna article is geared towards new Hams and antenna builders looking for a very inexpensive 6 band antenna that can be efficiently fed with 50 ohm coax without a tune

HSMM Experiments on the 6M Amateur radio Band

A nice post on Make: on homebrewing a multiband antenna for amateur radio portable operations

A simple project for an effective home made band pass filter, designed for the portable field day usage

Diamond W8010 Multiband Dipole Modifications

A clear TX wideband mod description for the FT-950. With pictures by PA1CA

Experimental Dual Band High Gain Flower Pot Antenna

The fan dipole antenna as an alternative to the paralled dipole antenna, to achieve a larger bandwidth and a better tuning by decreasing elenment influences.A project based on the W6HDG original concept.

Pictures and project design of a crossband VHF UHF repeater by LY3H

IARU Region 3 bandplan Revised 12 March 2019

How to design narrowband bandpass filters

Online calculator, Butterworth Bandstop (Notch) Filter Designer

22 Different Wire Antennas for the 160 Meter Band, Random Length Radiator Wire, delta loop, loop antennas, off-centered antennas, sloper, dipoles, Z antenna, Zepp and Clothesline Antennas