An online interactive grid square map made with openstreet map. Just point and click and zoom in to determine an accurate grid square locator till 10 digit resolution
The antenna described in this article is for 50 MHz, but the design can be scaled for any band, including VHF, UHF, or even the higher HF bands. The antenna is nothing more than a square loop of wire, approximately 30″ (or ~76cm) per side. The loop is fed in the middle of one side, and the opposite side to the feed point has a gap in it.
A 30 cm antenna for the six meters band in japanese
An technical page on coaxial cables that describes what coax cables are, how do coax cables works, what are RG cables and difference with several coax cable types, what they are used for, connector types and cable sizes
Experiences with software defined radios SDR and active antennas using the RTL SDR dongle and Spyverter HF up-converter
Article on the OQRS M0URX service and demands by dxpeditioners with examples and features of this original QSL service