APPLICATIONS Horn antennas are widely used as satellite dishes and radio telescopes. Antennas 6 2. PARABOLIC ANTENNAS A parabolic antenna is an antenna that uses a parabolic reflector, a curved surface with the cross-sectional shape of a parabola, to direct the radio waves.
Flu (influenza). Flu is usually infectious a day before symptoms start and remains infectious for about five to six days. Children and people with lowered immune systems may be infectious for a few days longer.
A Honor Society of Nursing (STTI) answered. The first symptoms of influenza type A, including fever, chills, headache, and body aches, often begin to go away after about 2 or 3 days. In some cases, these symptoms will last 5 days or longer.