This max size magnetic loop antenna for 14 MHz with a totall circumference of 6m is designed to attach to a wall
The circuit is based on two AD8307 log amplifiers, which are connected to the forward and reflected ports on a directional coupler
In this youtube video G8GKC M0KKW and 2E0IAJ from Icom UK give a global overview of the ICOM IC-7300 HF 50 70MHz Software Defined Radio transceiver
An homemade base plate for the hexbeam antenna
Will additional coax stubs improve Band Pass Filter performance?
Link End Fed Half Wave Antenna and Tuner for SOTA designed to work on 15m, 20m, and 40m.
Described here is a homemade transceiver covering HF , 6m and 2m. Modes of operation are USB, LSB and CW. Power output on HF is 10W, 6m 5W and 3W on 2m.
How to receive JT-65 signals using a cheap RTL-SDR dongle with the 820T2 tuner chip
Here is a simple FM broadcast transmitter, power output to the quarter wave antenna is less than 0.5mW so it has a range of a few tens of meters using a standard FM broadcast RX, it makes a very cheap baby monitor / bug.
How to understand resistor colour codes