The "DBJ-UHF" antenna was first presented at Pacificon 2010. It was based on a grant given to us by AC Daughty Inc in 2010. An article on this antenna was subsequently published in CQ - Summer 2012. It has been granted US patent 8,947,313. This is a unique design which met the requirements of AC Daughty Inc. Some of the features include 5dB gain, only 3 1/2 ft tall, no radials, up to 150 MPH winds and yet low cost. AC Daughty Inc. uses over 200 of these antennas in a MESH network in the NY Metropolitan area. Documentation is available upon request.

This antenna is complete with exception of Class 200 PVC pipe needed for the antenna. Cost of ordering and shipping the PVC tube cut for the antenna is $30 so we rather you go to Lowe’s (stock # 23990) or Home Depot (SKU #282-477) or Menard (SKU #6899684) and buy the PVC pipe for about $6 per 10' section. If you are unable to find the PVC pipe, it can be ordered separately on this page. DO NOT USE SCHEDULE 40 OR OTHER PIPE TYPE/MATERIAL, WARRANTY WILL BE VOID FOR NON-APPROVED USES.

Basic Specifications:

Overall Length: Approximately 3 1/2 feet, 50 ohm feed impedance, no ground radials. Antenna feedpoint is 10 inches above the connector. Thus U clamps, hose clamps, etc. can be used for mounting up to the first 10 inches of the antenna without affecting performance. Antenna offers “true” 2 element ½ wavelength phased radiator (centered tuned). End Connector SO-239, N Connector optional.


Custom tuned to GMRS Specifications
Configuration: Two element ½ wavelength phase collinear separated by 1/2 wavelength
Maximum power: 75 Watts
SWR: less than 1.3 to 1 over a 5 MHz bandwidth and less than 1.5 :1 over 10 MHz bandwidth.
Matching system: 1/4 wave matching stub, ½ wavelength phasing stub
Gain: 5 dB over reference ground plane

Impedance: 50 ohms