The Cushcraft AR-270 is essentially a ground-plane vertical antenna for both 2 meters and 70 centimeters. At just slightly more than 4 feet in length, the AR-270 functions as a 5/8-wavelength radiator on 2 meters. A coil assembly creates an electrical 5/8-wavelength for 70 centimeters as well. At the base of the antenna you find a small loading coil and three 63/4-inch radials (see Figure 15). The antenna weighs just two pounds and is rated for 250 W on both bands. The AR-270 assembles quickly. I needed only 15 minutes to attach the radial rods and join the upper and lower sections. The rods simply screw into the base, but the instructions caution against over tightening. They aren't kidding; I've seen rods like these instantly snap off with the overzealous application of a wrench.
展开▼
