A log-periodic antenna (LP), also known as a log-periodic array or log-periodic aerial, is a multi-element, directional antenna designed to operate over a wide band of frequencies. It was invented by John Dunlavy in 1952.
https://en.wikipedia.org/wiki/Log-periodic_antenna
Log‑Periodic Dipole Array Calculator by Serge Stroobandt, ON4AA and Michael McCue, W7YZT:
https://hamwaves.com/lpda/en/index.html
"A do-it-yourself" guide to design and construction of log periodic antennas:
https://www.robkalmeijer.nl/techniek/electronica/radiotechniek/hambladen/qst/1959/11/page11/index.html
Designing Log Periodic Antennas by Glen Dash, Ampyx LLC, GlenDash at alum.mit.edu:
http://glendash.com/Dash_of_EMC/Log_Periodic/Log_Periodic.htm
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