Which aspect of FM transmission allows for greater flexibility in frequency allocation?

FM transmission benefits from the use of higher band frequencies because these frequencies are less susceptible to interference and can support greater bandwidth for transmitted signals. This increased bandwidth allows for multiple channels to be allocated within the same frequency range without significant interference, providing flexibility in frequency allocation.

Higher band frequencies typically have more available spectrum, which means that more stations can coexist without interfering with one another. This is especially important in densely populated areas where frequency allocation is critical. Additionally, the propagation characteristics of higher frequencies tend to allow for a clearer transmission of signals over short distances, and they are often more efficient for line-of-sight broadcasting, further optimizing frequency use.

While lower, mid-range, and ultra-low frequencies have their advantages, they typically face more challenges related to interference, signal distortion, and sometimes less efficient allocation due to their propagation characteristics. These factors limit flexibility in how specific frequencies can be allocated for FM transmission, making higher band frequencies the most advantageous choice for maximizing channel availability and transmission quality.