Antenna Authority, Inc
Phone (770) 577-7969




Provides 4 cardioid patterns in the cardinal directions utilizing appropriate AAI modulator

Product Code --- DASA-3151 DF ANTENNA
Downloadable PDF file

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An Accurate Compact Antenna for Mobile Operations

The DASA-3151 Mobile DF Antenna is a 2 band VHF/UHF antenna consisting of annular slot elements recessed in the roof of a vehicle or on the underside of an aircraft. It includes the modulator, controller and coax cables. The antenna is designed to generate accurate and repeatable bearings on vertically polarized signals in the 20 MHz to 1000 MHz frequency range with extended coverage down to 1 MHz.

The DASA-3151 can be mounted above the headliner in a vehicle or remoted to most any flat area. It is primarily designed for use in a 4 door F-150, Tahoe or similar vehicle. All power and control signals to the antenna are provided through a single control cable via the DF processor. The received signal, with bearing information encoded, is routed to the receiver through RF coaxial cable. Control signals are compatible with the AADF-3100 DF Processor from Antenna Authority, Inc.

Corner detail

Installed in roof


Completed installation

Electrical Specifications

Frequency Coverage:                             

20 MHz to 1 GHz

Azimuths Coverage:                              

360 in azimuth


Manually set depending on receiver and
antenna location

DF Technique:                                      

Watson-Watt single frequency


 4-element dual annular slot, multiple bays

Bearing Accuracy:                                

 6 rms


Voltage: 11.5 - 14.5 VDC


Current 0.3 amps




50 ohms nominal




BNC, DB-9 

Mechanical Specifications


Width: 24"  -  Length: 32"


Height: 2",  Weight: 10 lbs


Operating: -40C to +60C


Storage: -40C to +70C   Humidity: 95%


Terne Metal, FR-4, Foam

 Typical Gain and Pattern of Annular Slot Antenna

Ordering Information

Antenna          Model No.      DASA-3151 complete with modulator and cables                

DF Processor required        Model No. AADF-3101

One year warranty on parts and labor

Specifications subject to change without notice

Printed in U.S.A. Copyright 1/22/2009

Downloadable PDF file

If you have a need for optimized frequency coverage not indicated here, please contact Ferrel  - info below - we can customize to your needs.

Antenna Authority offers a wide assortment of directional, wideband antennas and other equipment used for radio direction finding and Geo location. We are experts in covert antennas, vehicles and their operation. We are also ready to design new products to meet your specific needs.

Antenna Authority, Inc.                Ferrel Bentley - E-Mail
3381 W. County Line Road
Douglasville, Ga. 30135-1145
(770) 577-7969
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