Receive loop antenna; these work amazingly.
To build yourself, Kit C includes all items except 20 meters of loop cable.
A must for all stations and hear those weak stations with less noise.
These are passive antennas and do not require a power source.
Most modern radios have a dedicated receive antenna connection; an antenna selection switch can be used if your radio does not.
Do not transmit into these antennas; receive only.
Connector: SO239, requires PL259 connection.