Not all countries offer an online method to contact Consumer Affairs. If your country is not listed please click here to contact the U.S. Consumer Affairs, they will direct your comments to the appropriate department. 1  Argentina : (Pay Line) 0-810-444-0057. 2  Australia: 1-800-802-307.
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.The most common form is shaped like a dish and is popularly called a dish antenna or parabolic dish.n advantage of parabolic antennas is that most of the structure of the antenna (all of it except the feed antenna) is nonresonant, so it can function over a wide range of frequencies, that is a wide bandwidth.
A wire yagi antenna for 20 and 40 meters band suitable for outdoor and field day operations. Easy wire antenna for 40-20-10 meters. PE3HMP project of a triband wire antenna for 40 20 10 meters band, made using home made coils. How to Construct a Dipole. Basic and illustrated article on building wire dipole antennas. This page is about how to build a dipole antenna.