This max. size magnetic loop antenna for 14 MHz with a totall circumference of 6m. ( 19.68 feet ) is designed to attach to a wall . Not sutable for reenforced concrete walls . It has a no tune bandwidth of more than 300 KC with a centre swr of 1 : 1.1 The 150 pF parallel capacitor was the best value in my situation ( brick wall ) but can be replaced by a 250 pF tuning capacitor in order to find the lowest SWR at resonance. First contacts gave good reports in Europe. For max. performance be sure that the 'hot' side of the antenna points to the window. A test was made with 100 Watts without arcing however 5 Watts are more than enough for indoor use...
The top capacitor is made of twisted antenna wire or a piece of 25cm RG-213 coax and is cut for tuning to the frequency . This antenna can also be build on a fibre frame for field or attic use
The capacitor . A piece of RG-213 coax can also be used
Verry good SWR
Feedpoint with 100pF and 47pF in parallel. Notice the line choke.
