Practical_Antenna_Handbook_0071639586

370 P a r t V : H i g h - F r e q u e n c y A n t e n n a s f o r S p e c i a l i z e d U s e s
Vee dipole
Figure 15.4B Vee dipole.
this antenna, just as it is for the longwire and windowsill antennas. At a minimum, a
monopole should have a counterpoise or elevated ground consisting of at least two or
three radials per band.
A directional rotatable dipole is shown in Fig. 15.7. This antenna is made from a
pair of commercial mobile antennas connected “back-to-back” on a horizontal length of
1-in × 2-in lumber and fed in the center with a coaxial cable or open-wire line. The two
antennas can be clamped to the wood center support with standard hardware store hose
clamps or strong cable ties. The tips of the mobile antenna determine where each half-
Rope
A
Insulator
B
Center insulator
Coax
C
D
Rope
Insulator
Figure 15.4C Bent dipole.