[1] Nichols Eric P.: Propagation and Radio Science. ARRL, 2015
[2] Ford Steve: Get on the Air with HF Digital. ARRL, 2018
[3] Pole Ian, Telenius-Lowe Steve: Successful Wire Antennas. RSGB, 2014
[4] Read Gilles: 60 Antennas you will want to build, RSGB, 2018