A month ago during the 2011 CQ Worldwide Phone contest I lost my roof-top hexbeam to wind. Areas around me would not only suffer damage from the wind but also record snowfalls. I got off lucky, altough my hexbeam did not. Also to note, this was a homebrew antenna and not one commercially made. The hex is an excellent design and definately gets the job done, so no complaints here.
With that out of the way, I was on a search for some aluminum and recently encountered a Hy-Gain Explorer 14 (EXP-14) that was in the attic of a local ham. I knew nothing of this Hy-Gain model, but the specs seemed to be right in line of what I was looking to accomplish. The price was right and it was in excellent condition. In speaking with the seller, the beam used to belong to a local club who unfortunately lost access to put up towers for field day and this beam was one of the casualties.
The Hy-Gain EXP-14 has a unique feed point (as they even state in the manual) with parasitic driven elements on 10m. It weighs approximately 45lbs, 14ft boom with a 17ft turning radius, perfect for my rooftop mount.
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I had to beam built, tuned and installed in what seemed to be record time, only taking 3 1/2 hours. Part of that time included running out to Home Depot for a 12″ mast (above the rotor) and prepping the coax with ring terminals.
Once the beam was up, I could hear a drastic difference compared to my temporary bob-tail curtain on 20m. The first stations I heard were from India and Oman. Keep in mind, all of this was going on during the CQ Worldwide CW contest that I unfortunately could not commit a serious amount of time in due to the holiday, but ended up being a good time to test the new antenna and tweak the station.
The antenna is only sitting about 25ft off the ground, 6ft from rooftop. I was concerned with takeoff angle with the antenna being so close to the ground, but the fact that I was able to work into the Middle East, India and Asiatic Russia all while barefoot, says something.
In the photo, it may look like the antenna is mounted to the chimney, which it is not. The mount is a modified non-penetrating roof mount for DirecTV-type satellite dishes with 8 low-profile concrete blocks acting as ballast. The lower mast is guyed to the plate that holds the blocks. The mast is then guyed to the 4 corners of the house and attached just below the rotor.
