? Frequencies range from low-frequency (LF) to ultra-high frequency (UHF). Low-frequency waves are the longest waves and have the greatest range, but are the weakest and least able to penetrate obstacles. High-frequency waves are shorter, stronger, and able to penetrate obstacles easier than low-frequency waves, but their range is significantly shorter. UHF waves are the shortest, strongest and most able to penetrate obstacles but also have the shortest range. The following are all frequencies within these categories: Low Frequency (LF): 3 kHz - 30 kHz Medium Frequency (MF): 300 kHz - 3 MHz High Frequency (HF): 3 MHz - 30 MHz Very High Frequency (VHF): 30 MHz - 300 MHz Ultra High Frequency (UHF): 300 MHz - 3 GHz