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Antennas are simply lengths of conductive metal that radiate radio signals into the air. Most common antennas are designed to be one-quarter, sometimes one-half, and the wavelength of the radio signal they are to transmit/receive. Wavelength is calculated with the formula: Wavelength (meters) = 300/frequency (MHz). For example, OMNEX HopLink radios use frequencies ranging from 902-928MHz, so based on this formula, the wavelength of our radio signals are approximately one-third of a meter, or one-foot. Keeping in mind then that antennas are generally one-quarter wavelength of the radio signal, our basic antennas for the 900MHz HopLinks are typically no more than 3 inches in height. There are wide varieties of antennas used for the transmission of radio signals in the world today. The basic antenna is known as”omnidirectional.” omni antennas radiate their RF energy in all directions, essentially outwards in a three-dimensional spherical pattern. omni antennas usually resemble vertical rods but can come in other shapes as well.

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