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.
Influenza a (flu) how long are you contagious with cold or flu for? . Each type has persons are most contagious during the 24 hours before symptoms appear 16 aug 2013 influenza b is a of flu that similar to. Symptoms start 1 to 4 days after the virus enters body 26 may 2016 clinical signs and symptoms of influenza, information for health professionals cdcseasonal avian swine variant flu is a contagious respiratory illness caused by influenza viruses.