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Highlights

The Keysight 85574A serves as a portable wideband antenna, functioning across a frequency range of 20 MHz to 8.5 GHz. Designed primarily for RF direction-finding and transmitter hunting, it seamlessly integrates with the Keysight FieldFox handheld spectrum analyzer equipped with Option 366, the interference-finding (manual) application, and Option 307, the GPS receiver. This combined setup empowers network managers to efficiently pinpoint sources of RF interference.

  • Provides a compact, light design that's easy for a single person to operate.
  • Delivers wideband performance in a practical size.
  • Supports horizontal and vertical polarization.
  • Offers precise bearing to source with a digital compass.
FieldFox Interference Finder Solution Option 366 with 85574A antenna locating a signal source

Interested in an 85574A?

Featured Resources for the 85574A Handheld Direction-Finding Antenna 20 MHz to 8.5 GHz

Data Sheets 2026.05.12

85574A Handheld Direction Finding Antenna

This data summarizes the technical performance of an antenna used with the FieldFox handheld analyzers for the direction finding.

2026.05.12

Data Sheets 2026.04.10

FieldFox B-Series Handheld Analyzers

The FieldFox datasheet update includes new B model versions.

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Data Sheets 2025.07.21

FieldFox A-Series Handheld Analyzers 4/6.5/9/14/18/26.5/32/44/50 GHz

This document is the FieldFox Data Sheet

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Data Sheets 2026.02.23

FieldFox C-Series RF Handheld Analyzers

The FieldFox datasheet update includes new C model versions.

2026.02.23

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