Our antenna structure currently is a 55-foot Rohn 25 located between the house and the two-story shack structure. At the 55-foot level is a dual-band vertical for 2-meters and 440. Just below it is a Mosley TA-33M for 10-15-20 meters with a Mosley 40-meter rotatable dipole add-on kit. The beam is rotated with a Ham IV rotor. A Wyndom wire antenna is attached to the tower at the 55-foot level with the ends pointing NW to SE. This antenna is fed with 600-ohm twin-lead to a 4:1 balun at the base of the tower and then with coax to a Collins 180S-1 antenna coupler in the shack. The entire tower can be loaded for operation on the 75-meter band through a shunt-fed loop. Ground radials snake from the tower through the flowerbeds and lawn area to complete the return circuit.


Now Here's a Real Antenna Farm!

This is a portion of the antenna farm at Collins Radio Company in Cedar Rapids looking due south toward the Engineering Building. These antennas are part of Comm-Central, a commercial HF radio station operated by the Collins company. The directional antennas are Collins Log Periodics and mono-band beams. The antenna farm was built in 1962 and is the "business end" of some very powerful state-of-the-art Collins HF transmitters. The photo was made during an inspection tour by the Collins Collectors Association in August 1996.

For serious DX-ing, you might try building a couple of billboard arrays! This view looks northwest and shows three billboards. The one at the left is a directional 100-foot tall array for 9-27 MHz which can be "electrically" rotated 360 degrees. The structure on the right is actually two arrays-- one for 9-27 MHz aimed at 330 degrees and another for 3-6 MHz aimed at 315 degrees. Sadly, the low-band array was demolished in late October 1996.




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This page created on December 15, 1996
Last Update was: October 1, 2000