Before raising an extension ladder, you should check to make sure the __________.

Before raising an extension ladder, ensuring that the overhead is clear is crucial for several safety reasons. This step prevents potential accidents that could occur if the ladder comes into contact with overhead obstructions such as power lines, branches, or building eaves. Striking these hazards while raising or maneuvering the ladder can lead to serious injuries or even fatalities.

Having a clear overhead allows the firefighter to safely deploy the ladder to the desired height without encountering obstacles that could cause the ladder to tip or cause damage to the equipment itself. It's essential to perform this check in conjunction with other considerations like the condition of the ladder and the flatness of the area, but the primary focus on ensuring a safe path above makes this the most important step before raising the ladder.