Which of the following antennas is commonly used in communications for a frequency band of 10 MHz to VHF and UHF?

Yagi antennas are highly directional antennas widely employed for point-to-point and point-to-multipoint communication in the VHF (Very High Frequency) and UHF (Ultra High Frequency) bands, covering the specified frequency range efficiently.

Dipole antennas are fundamental and versatile, but they are generally less directional and efficient than Yagi antennas for specific directional applications in the higher parts of the VHF/UHF range.

Parabolic grid antennas are highly directional and are primarily used for microwave and higher frequency bands (typically several GHz) for long-distance communication, not commonly for 10 MHz up to UHF.

Omnidirectional antennas radiate equally in all directions and are used for general coverage, but they are not the common choice for directional communication within the specified frequency range where a Yagi would excel.