Why In free space, every electromagnetic wave travels at the speed of light, about 300,000,000 meters per second (3 x 10^8 m/s), regardless of frequency. Frequency and wavelength change together so that their product always equals that constant speed: wavelength (meters) = 300 / frequency (MHz). Nothing about being microwave, UHF, or VHF makes a wave move faster or slower in a vacuum.
Watch out Picking microwaves confuses high frequency with high speed; microwaves have shorter wavelengths and more cycles per second, but each cycle still propagates at c.
Higher frequency means shorter wavelength, not faster travel. In space, everything runs at 300,000,000 m/s.