The W8JK is a famous and effective DX antenna, first built by John Kraus, W8JK, in 1937. A Beam antenna with two parallel dipoles driven with opposite phase, with a close spacing of an eighth of a wavelength.
Portable Vertical Antenna for 75m and 40m featuring Low radiation angle for DX, easy to install and to match 50 ohms
Baluns are usually used by Hams to feed dipole antennas with 50 ohm coax and to transpose from ladder line feeding a multi-band antenna to the unbalanced input of an antenna tuner.
A homebrew four elements log periodic antenna for HF bands
How to modify a Sky mini-dish so it will work effectivly at 2.4Ghz.
This project is based around the recent HF1 QRP transceiver by Ashhar Farhan, VU2ESE. The transceiver is an interesting SSB design with wide tuning range from 0-30MHz and should cover several amateur bands. The schematic for the transceiver can be found on the Minima mail list in this post with a PDF attachment
The Vertical Moxon had everything I was looking for, a low TOA (Takoff Angle), wide horizon coverage, and good impedance loading. All of this was in a small enough package to fit in my relatively small back yard.
A very informative review of the Icom IC-7300 direct RF sampling transceiver, including audio samples, recordings and a comparison vs the Elecraft KX3
The main issues with portable HF operations have become not issues of the transmitting and receiving equipment itself but of providing power and antennas
An Arduino based remote monitoring system. The Remotino is a remote monitoring system based upon two Arduino Nano units RemotinoSampler and RemotinoViewer that are connected