Online HB9CV antenna calculator, accept as input the desired resonating frequency and provides dimensions for spacing and length of each element, including boom and radiator diameter.
Make your own dipole for 40 and 80 meters band, assembling standard product parts like 40 meter traps, the 1:1 balun and insulators
A basic YAGI UDA online antenna calculator, accept as input frequency, number of elements, diameter of parasitic element and boom diameter. This online calculator will generate a basic design data including each element length and spacing.
Setting up the Yaesu FT-817 and Signalink for data mode communication. Hardware and software required for data mode communication, connect and configure FT-817 and Signalink
This article explains the trick of how to shorten and lengthen pairs of radials to make a 2-band ground plane antenna. Included is a “Table of Multi-Band Possibilities” covering the range of 6 to 40 meters.
This page reports the last six daily MUF(3000)F2 plots recorded at Rome observatory by the AIS-INGV ionosonde. Provided Istituto Nazionale di Geofisica e Vulcanologia (INGV) Italy.
How to use a little known J-antenna characteristic to reduce a conventional 14 foot antenna to 7 feet. Perfect 50 Ohm match, same gain, no radials.
The international SWL Contest is oen to SWL all over the world. You can use a real radio receiver or a kiwi or web SDR. We have many sponsors who will give nice gift for best listeners of AM radios on SW and MW.