As you will see in the documents, the EH Antenna features very high efficiency, wide bandwidth, small size, and no ground radials required (Translation: low cost system). Compare this to the conventional tower with 120 buried ground radials that has lower efficiency, larger size and several acres of ground required.

One significant virtue of the *STAR* antenna is the ability to trade height vs. radiation along the ground. In other words, more height less power, or conversely less height and more transmitter power for the same radiation level at a distance. Another is that this antenna develops radiation at the antenna (compared to far field radiation from a standard antenna), thus very small E and H fields, virtually eliminating any EMI. Another is that this antenna is a dipole, therefore it does not use any ground radials. If you take advantage of all of these, you can envision an AM Broadcast Antenna mounted on top a building in the center of a city. That is where most customers are located; it is also where there is the most background receiver noise. If the antenna is placed there, the strong signals give good citywide coverage, yet in the rural areas a lesser signal is required where there is less noise.

We now have two AM broadcast antennas, a large one for the low end of the band and a small one for the high end of the band. These are detailed in a speech given to the National Association of Broadcasters in April 2004 and is contained in this section (Power Point presentation). From a historical perspective, the large antenna was developed based on test results from smaller antennas. It has been tested in accordance with FCC field test requirements and has proven to be successful. Recently, we were finally able to develop a computer program to define all of the EH Antenna characteristics, including bandwidth and efficiency, except the radiation pattern. That program was used to develop the new small antenna. This antenna was specifically designed for those radio stations in the new segment of the band above 1600 KHz, but is applicable down to 1200 KHz. The cylinder length to diameter ratio sets the antenna pattern, while the diameter sets the bandwidth. Both the large and small antennas have a length to diameter ratio of 6.

Here are the parameters of the “small” AM Broadcast antenna:

1.       Each cylinder is 8 inches in diameter and 48 inches in length.

2.       At 1600 KHz the performance parameters are:

·         Radiation resistance – 77 ohms

·         3 dB bandwidth- 99 KHz

·         Efficiency – 98%

If this antenna is mounted at a height of 1/8 wavelengths it will outperform a “standard” ¼ wavelength vertical. It is so small it lends itself to mounting on top an unguyed tower. For more detail see the “NAB 2004 Presentation”.

Thanks for visiting our web site. We only furnish the antenna components (a kit) while others perform the installation and other related activities, including field tests and paper work. Graham Brock, inc. (www.grahambrock.com) performed the testing on the prototype antenna and will be pleased to provide detailed information. They also provide consulting, installation, and all other related activity for new antennas.  We will be pleased to answer questions related to the antenna itself.

Please look at the picture of the AM Broadcast antenna with the standard radio station antenna in the background. This is the antenna used in the test program. Other broadcast antennas will look the same except they will be painted and the feed line to the upper cylinder will be inside the lower cylinder.

The next AM Broadcast antenna will be installed in Williams, Arizona and will operate under the call letters KYET.

To broaden your understanding of the EH Antenna, please review the NAB 2004 files located in the Library.