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| 22 be substantially more than the non-resonant electrical length or effective area. This makes a resonant antenna attractive for narrow-band applications because the resonance operates over a limited bandwidth. Other methods exist, such as combining different resonant structures, using fractal designs, or tuning to enhance the bandwidth of an antenna over a greater frequency range. Power Handling and Thermal Considerations The power handling capability of an antenna is a measure of the maximum (peak) and continuous power an antenna can radiate before derating or being damaged. As all conductive elements of an antenna have losses, some of the transmitted and received energy is converted to thermal energy. Excessive transmit or receive power can result in overheated elements that damage the antenna and possibly degrade or destroy any dielectric structures or radomes. Environmental Durability and Protection Another set of antenna parameters is the environmental conditions for which an antenna is suitable. Factors such as temperature, wind shear, shock, vibration, radiation, cosmic weather, corrosive gases or liquids, and humidity are all common considerations for antennas in extreme environments. In response, engineers often use radomes to protect more sensitive antenna elements. However, radomes also affect the behavior and performance of an antenna system. Feed Interconnect The feed interconnect dictates how the feed line is connected between the transmitter/receiver and the antenna terminals. Typical antenna feeds include single conductors, dual conductors, transmission lines, and waveguides. Antenna Types Antennas are typically categorized as either omnidirectional or directional. Omnidirectional antennas present a 360-degree azimuth antenna pattern with varying degrees of vertical coverage. Directional antennas are concentrated on a specific direction or a limited range of directions, presenting an azimuth antenna pattern of less than 360 degrees.