[问答题]
A radio station operating at 102.1
i*0ws oucsv h/+65kfv MHz broadcasts f
m:c/sel., vji rom two identical antennae at the same elevation but separated by an 8.0-m horizontal distance d, Fig. 24–60. A maximum signal is found along the midline, perpend
eicjvsm./ l,: icular to d at its midpoint and extending horizontally in both directions. If the midline is taken as 0$^{\circ}\,$, at what other angle(s) $\theta$ is a maximum signal detected? A minimum signal? Assume all measurements are made much farther than 8.0 m from the antenna towers.
