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Nonresonant single-wire longwire antennas 227 Beverage on relatively constant vertical polarization that makes me suspect the claims of Beverage-like performance above the 25- or even 31-m bands The Beverage depends on being erected over poorly conductive soil, even though the terminating resistor needs a good ground Thus, one source claimed that sand beaches adjacent to salty marshes make the best Beverage sites (a bit of an overstatement) Figure 9-13 shows why poorly conductive soil is needed The E-field vectors are launched from the transmitting antenna perpendicular to the earth s surface Over perfectly conducting soil, the vertical waves would remain vertical But over imperfectly conducting soil, the field lines tend to bend close to the point of contact with the ground As shown in the inset of Fig 9-13, the bending of the wave provides a horizontal component of the E-field vector, and this provides the means of generating an RF current in the conductor wire A debate among Beverage antenna fans regards the best length for the antenna Some sources state that the length can be anything greater than or equal to 05 , yet others say greater than or equal to1 is the minimum size One camp says that the length should be as long as possible, while others say it should be close to a factor called the maximum effective length (MEL), which is 100 1 K
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where MEL is the maximum effective length, in meters is the wavelength, in meters K is the velocity factor, expressed as a percent Misek, who may well be the leading exponent of the Beverage antenna, uses numbers like 16 to 17 over the 18- to 73-MHz region, and 053 to 056 on frequencies lower than 18 MHz Doctor Beverage was once quoted as saying that the optimum length is 1 Like the longwire antenna, the Beverage needs a termination resistor that is connected to a good ground This requirement might be harder to meet on Beverage antennas because they work best over lossy ground, which doesn t make a very good ground connection As in the longwire case, insulated or bare wires, a quarter-wavelength long, make the best radials However, a substantial improvement in the ground is possible using just bare wires measuring 15 to 20 ft long (which is much less than /4), buried in the soil just below the surface (far enough to prevent erosion from bringing it to the surface) Many articles and books on Beverages show ground rods of 2 or 3 ft long, which borders on the ridiculous Poor soil requires longer ground rods, on the order of 6 to 8 ft Copper-clad steel makes the best rods In addition to the radials and ground rod, Misek also recommends using a wire connection between the ground connection at the termination resistor, and the
228 Longwire directional antennas
Direction of propagation
E-field Wire 90
Medium conductivity ground
Good conductivity ground
9-13 Performance of Beverage antenna over different values of ground conductance
ground connection at the receiver transformer (see again Fig 9-12) According to Misek, this wire helps to stabilize the impedance variations at higher frequencies Installation of the Beverage antenna is not overly critical if certain rules are followed The antenna should be installed at a height of 6 to 10 ft off the ground, and it should be level with the ground over its entire length If the ground is not flat enough to make a level installation possible, then try to use a height that is 6 to 10 ft above the average terrain elevation along its run A popular installation method is to erect 16-ft 4 4 lumber, such that 3 to 4 ft are buried in a concrete-filled posthole Use lumber that is treated for outdoor use (ie, pressure-treated lumber sold for decks and porches The wire can be fastened to the 4 4 posts using either ceramic standoff ( beehive ) insulators or electric fence insulators (which some people deem preferable) Try to use one contiguous length of wire for the antenna, if possible, in order to avoid soldered splices and joints One of the Beverage installation difficulties shared with the longwire is the need to slope down to a point where a termination resistor can be easily installed close to the ground While the longwire can be sloped over a large portion of its length, the Beverage should be sloped downward only over the last 60 ft or so
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