Before revision: Active antenna designs allow antennas of limited size to have a wider frequency range (bandwidth) than passive antennas, and are primarily used in situations where a larger passive antenna is either impractical ( inside a portable radio ) or impossible ( suburban residential area that disallows use of large outdoor low-frequency antennas) .
After revision: Active antenna designs allow antennas of limited size to have a wider frequency range , such asbandwidth) than passive antennas, and are primarily used in situations where a larger passive antenna is either impractical ( inside a portable radio or on a vehicle, or impossible, such as in a suburban residential area with restrictions on large outdoor antennas .