paraboloidal antennas are common for very high frequencies and into the cellular telephone systems and personal communication systems . paraboloidal antennas are often used at the base station of either cellular telephone antennas , pcs antennas or both . to avoid possible channel drop out because a sharp focal point of the antenna is misaligned by improper installation or harsh weather conditions . for base stations for cellular telephone systems and / or systems , pcs , a generally paraboloidal antenna that has a less sharp focal point so there is a antenna lower gain , but less relative signal degradation because of weather or other misalignment of the antenna . in such cases , the lower gain , but higher immunity to drop - out more than justifies such arrangements .