EH Antenna Systems
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Introduction to the EH Antenna

Welcome to and the wonderful world of EH Antennas. Those of you who have visited this site previously will find major changes, primarily deletions. Diversified Technology Inc. (DTI), based in Ridgeland, Mississippi, has obtained a license to develop, manufacture, and sell EH Antennas for all applications, excluding AM broadcast and ham radio. In conjunction with selling the license for three of his EH Antenna patents to DTI, Ted Hart has agreed to work with the company as a consultant to develop the EH Antenna for specific applications.

Military tests have proven that the EH Antenna, which is much smaller than standard antennas, significantly enhances the communications range of radios. The military is now funding DTI to develop EH Antennas for various military radios. The significance of this new antenna cannot be overstated; the Director of Research for the Department of Defense has even declared it to be a “quantum leap in technology.”

The EH Antenna has very broad applications. For example, a small loop antenna modified to be an EH Antenna provides a significant enhancement to RF Identification (RFID) systems. In addition to increasing the range to the transponder (tag), it allows a large number of tags to be read simultaneously. The modification of the loop antenna produces a radiation pattern which is orthogonal to the loop. As there is no reactive field, the tags are immersed in a true radiated field. This allows more freedom in the positioning of the transponders. In contrast to older systems which required tags to be parallel to the axis of the conventional loop antenna, practically any orientation of the EH Antenna and the tags will provide maximum magnetic coupling.

The first commercial EH Antenna for AM broadcast is now operational in El Salvador. There, as in so many places, land acquisition presents a significant problem. In many areas the amount of land needed for conventional antennas requiring large ground radial systems is cost prohibitive. Other areas lack sufficient land that is flat enough to position radials. Of course, the economic factor is paramount; thus the unique characteristics of the EH Antenna make it the antenna of choice.

An additional advantage of the EH Antenna is that it provides signal power equal to that of a conventional tower while requiring only half the conventional tower’s height. This website includes a document entitled “El Salvador,” which reports on the installation and test of the first 700 KHz EH Antenna. Many more EH Antennas will follow.

A process has been initiated that will allow the FCC to grant broadcasters a license to use the EH Antenna in the United States. Current regulations require AM broadcast antenna vertical radiation patterns to conform to a specific equation that was originally devised for a conventional tower with radials. The EH Antenna is especially well suited for night-time operation because it requires a smaller vertical radiation pattern.