rong signal handling over a wide frequency range. This is necessary because the antenna is untuned and will pick up signals over a wide frequency band, some of which will be very strong. To achieve the required performance devices capable of handling relatively high powers are used. Poor performance will result in intermodulation products being generated, and the receiver seeing many more signals than the receiver element is actually picking up. Practical aspects of installing antennas The practical aspects of antenna installation are particularly important. The performance of the antenna can be dependent as much if not more on the location and the way the antenna is installed as on the design of the antenna itself. It is therefore worth while spending some time and space to outline some aspects of antenna installation. Location There are many types of antenna installation that can be seen. They range from small domestic antennas for applications such as broadcast television of radio to large commercial installations for broadcast, satellite or one of a variety of applications. Whatever the application the location can play a large part in the performance of the antenna. For most people the installation of an antenna will be associated with a domestic installation, although the same basic concepts apply to any antenna installation. Height is an important consideration. For optimum operation the antenna should be above any local objects that might tend to screen the antenna. This is particularly important where low angles of radiation are required. It is also found that additional height also tends to reduce the effect of local interference, reducing any electromagnetic compatibility (EMC) problems that may occur. For many domestic installations it is necessary to have the antenna mounted internally. Although this is not ideal it is still possible to achieve satisfactory levels of performance in many instances. The structure of the house will introduce a degree of attenuation, but if it is situated in a high signa