The Keysight 11966N is a broadband, relatively high-gain antenna that is suitable for both commercial and military EMC measurements. Its frequency range covers 200 MHz to 5 GHz which is useful for some of the new commercial test requirements, such as FCC part 15 limits for high-speed unintentional radiators, which now extend beyond 1 GHz.
The 11966N can be purchased directly from ETS-Lindgren.
