Germany - Rund Funk Radio - circa 1920s
Two small loops mounted on tables and large loop mounted on far wall with feedpoint shown at lower left.

Three small loops shown in the Paris test laboratory of FM inventor Major E. H. Armstrong.  Circa 1920s.

Control point for VLF receivers  at Council Crest near Portland, Oregon.  Photo taken 1927 when this coast station was owned by Federal Telegraph Company.  Note the very large outdoor receiving loops.

Radio direction finding truck used by British Post Office in 1927 to find illegal radio transmissions.

Operating room for coast station WCC Cape Cod, MA showing large indoor receiving loop.  Circa 1930s.

SCR-131 field radio used during 1930. Frequency range was 4.0-4.36 MHz with the LP-7 loop antenna used for both transmitting and receiving.

British solder demonstrates a small loop antenna to the Queen in 1937.

Balkans Campaign - 1942

COMROD (2004).  The HF230-B is a compact HF antenna for rapid deployment to create a base station working the frequency range 1.6-30 MHz and designed to provide Near Vertical Incident Skywave (NVIS)

COMROD (2005). HF230L_OTM is a compact HF antenna for on-the-move vehicular platforms from 2 to 30 MHz.   It is designed to provide superior Near Vertical Incident Skywave (NVIS) performance at distances from 0 to 500 km allowing continuous communications for ground-wave, NVIS and skywave applications.