transmitting capability. Because of this line- of-sight imposition, you should try to transmit from the highest point in the area. All survival radios should be held at least 14 inches above the surface for best results. Signal range increases proportionally with the altitude of the search aircraft provided the line of sight is not obstructed. Degradation can be expected when the radio set is operated in bad weather and inside areas of rugged terrain. The radiated ranges given are obtained when the half-wave antenna is used; the range is typically one-third less when the quarter-wave antenna is used.

Hand Signals

Hand signals are used by all helicopter crewmen. All air crew members must be thoroughly familiar with the rescue hand signals to ensure the success of the rescue attempt. All aircrewmen must memorize the hand signals shown in figures 5-37, 5-38, and 5-39.

Figure 5-38. - Signals to the hoist operator after hookup to the rescue hook.

Figure 5-39. - Signals from the hoist operator after hookup to the rescue hook.