Antennas websites:
Ham Radio Wire Antennas
Dipole - Inverted Vee Antenna Calculator
Cubical Quad Antenna Calculator
http://www.wa2ooo.com/SWR.html
https://www.qsl.net/va3iul/Antenna/Wire%20Antennas%20for%20Ham%20Radio/Wire_antennas_for_ham_radio.htm
http://www.amateurradio.bz/40_80_160_meter_antenna.html
http://ac6v.com/antprojects.php
https://www.hamuniverse.com/basicantennas.pdf