
P
High-Band (Millimeter Wave) 5G Antennas —
Very tiny, used by 5G cellular devices operating
near 30GHz (10mm).
Q
ALLISS — Commercial, government, and
high-power shortwave stations with coverage
that needs to be changed directionally may
use giant, steerable ALLISS antennas (from
the French towns of Allouis and Issoudun).
R
“Elephant Cage” (AN/FLR-9, AN/FRD-10) —
During the Cold War, massive ring antenna
systems were set up to monitor and locate
radio transmissions worldwide. The last of
these “elephant cage” antennas can still be
seen in Canada and Alaska.
LOOP
Unique in that many of them respond to the
magnetic rather than the electrical portion ...