Active Monopole/12" Loop Antenna, Battery Powered EHA-51B

  • Rod/Loop Antenna


A.H. Systems EHA-51B Antenna is an active, general-purpose, receive-only monopole and loop antenna for magnetic and electric field testing.


  • Broad Frequency Range of 1 KHz to 60 MHz
  • Individually Calibrated
  • FCC, MIL-STD, VDE and TEMPEST Testing
  • Rugged Construction
  • Battery Operated for Enhanced Portability

CAGE Code: 54656
Schedule B: 8529.10.9000

Product Details

The A.H. Systems EHA-51B Antenna is an active, general-purpose, receive-only antenna that covers 1 KHz - 60 MHz. This antenna has a switchable front end for receiving as a monopole or loop antenna.

As a monopole antenna it is ideal for instantaneous bandwidth scanning (without tuning) of electric fields in its frequency range and can drive any receiver with 50-ohm input impedance.

The EHA-51B is also an active receive only loop antenna for magnetic field testing. This loop antenna is ideal for emissions testing and has a balanced Faraday shield to reduce the E-field response for a pure magnetic field measurement. It is suitable for MIL-STD, VDE, and TEMPEST testing, with reliable, repeatable measurements.

    Included parts:
  • Switchable Preamplifier/matching network
  • 12" shielded Loop antenna
  • Telescoping Rod Antenna
  • Battery Charger
  • ADP-201 BNC(f) to N(m) Adapter
  • Antenna Calibration Manual

Antenna Specifications

EHA-51B Rod/Loop Antenna
Frequency Range: 1 KHz - 60 MHz
Impedance: 50 ohm
Connector: BNC, female
Mounting Base: ¼ - 20 Thread, female
Physical Dimensions:
Ground Plane Dimensions: 18 in. x 18 in.

Typical Antenna Data

EHA-51B Rod/Loop Antenna

Additional Resources

EHA-51B Rod/Loop Antenna

Adobe Acrobat Product Datasheet

Adobe Acrobat Operation Manual

Adobe Acrobat Outline Drawing

Adobe Acrobat EMC Related Formulas

Magnetic Convertion Formulas

Shielding Effectivness Test Guide

Shipping Information:
Carton size: 21" x 21" x 5"
Shipping Weight: 10 lbs.
* These are approximate dimensions and will vary depending on other items ordered.

Recommended Accessories

EHA-51B Rod/Loop Antenna
Plastic Tripod

ATU-514 - Plastic Tripod

The ATU-514 is a collapsible tripod is built with all non-metallic materials that will not influence your antenna measurements.


Az and El Head

AEH-510 - Az and El Head

The AEH-510 Azimuth and Elevation head is used to assist the test engineer in pointing the mounted test antenna towards the device under test. This adjustable antenna mount has a rugged 4" mounting surface with a Captive 1/4-20 male thread for mounting all of A.H. Systems and most other compliance measurement antennas.


3 Meter BNC/N Cable

SAC-212 - 3 Meter BNC/N Cable

Our custom made microwave/RF cable assemblies provide repeatable, reliable performance for use in a variety of commercial and industrial applications.


ECSM Fixture

ECF-10 - ECSM Fixture

The ECF-10 is a 10 pF capacitance fixture used for system checks and calibration of the active monopole antennas. One of the functions of the matching network is to convert the high impedance input of the antenna element to the 50 ohm impedance of the measurement receiver. The 10 pF capacitor ensures that the correct source impedance is present during the check.