Background
Radio amateurs use allocated frequency ranges throughout the RF spectrum. Once licensed, radio operators can broadcast freely within designated power limits, utilizing a government-designated call sign as a means of identification.
Antennas
The antenna is crucial to the success of a ham radio, as a weak or nonfunctional antenna can seriously hamper even powerful receiving and transmitting equipment. There are various categories of antennas in common use -- such as vertical, dipole, reflector and loop antennas -- all of which can be made at home with the proper knowledge and materials.
Homemade Antennas
One of the easiest antennas you can make at home is a ground plane antenna, made by soldering copper wires to a ham radio antenna adapter plate, bending the wires to an appropriate angle and attaching the apparatus to the ham radio receiver with a coaxial cable. You can find detailed instructions for constructing a ground plane antenna, as well as other types of antennas, on ham radio websites.