When trying to control radio signals from leaking outside of a building, a ______________ antenna should be used.

A dipole antenna radiates omnidirectionally in the horizontal plane, sending signal energy in all directions including through exterior walls, which directly causes the leakage problem rather than solving it.

A dome antenna is an omnidirectional ceiling-mount antenna intended for broad indoor coverage; its radiation pattern does not discriminate between interior and exterior directions.

Panel antennas produce a narrow, focused beam that can be deliberately aimed toward the interior space of a building, concentrating coverage within the intended area and sharply reducing the energy projected outward through exterior walls. This directional control is a standard in-building wireless design technique for establishing clear RF boundaries and preventing interference with external systems or adjacent facilities. Unlike omnidirectional antennas, panels give the designer precise spatial control over where the signal propagates.

A Vee antenna has a broad bidirectional pattern that lacks the tight directional control needed to effectively contain RF energy within a building.