The Gray-Hoverman antenna has been designed by Doyt R. Hoverman and it was patented in the sixties. His design only covered a part of UHF band. However, with some improvements, the antenna can receive well both the UHF as well as VHF-Hi. This post will show two variants of this antenna that can be used to receive 170 to 230 MHz channels (5 - 12) and a part of UHF between 470 - 720 MHz (21 - 52 channels) with a minimum gain of 5 - 6 dBi. These are the simplest to build. There are however designs that offer a minimum gain of 8 dBi on VHF and 10 dBi on UHF (check the Links section). These antennas can be used for any kind of signal that can be received on the mentioned frequencies: analog TV, DVB-T, DVB-T2, ISDB-T, ATSC. The design is distributed according to the GNU GPL version 3 license.
|Variant 1 (links 2 and 4)|
|Variant 2 (link 3)|
The gain of these antennas is shown below (4nec2 simulation).
|Gain (dBi) of variant 1.|
|Gain (dBi) of variant 2.|
The performance of these antennas can be improved by adding some reflectors. See the designs here. No reflector variant is easier to build and receives two sides. See its radiation pattern below.
|Radiation pattern of no reflector antenna|
|Construction detail. 1. Duct tape 2. Pass through hole to prevent a cable position that would allow water to enter and oxidize the cable wires.|
Have you built this antenna? How does it perform for its simplicity?
- Wikipedia. Television channel frequencies.
- The Gray-Hoverman Antenna for UHF Television Reception - Digital Home Canada
- Nikolai Mladenov. nikiml's Antenna pages.
- SBGH-6 Tophat NARODs for VHF-Hi.
- unclesam. NAROD Bending Jig for Gray Hoverman TV Antenna (CC-BY-SA). Available on Instructables.
- Новые антенные усилители. RadioRadar.net