What type of antenna receives and transmits wireless signals with equal strength in all directions?

An omnidirectional antenna is designed to receive and transmit wireless signals uniformly across all directions in a horizontal plane. This makes it particularly useful for applications where signals from any direction are expected, such as in mobile and portable communication devices. The design of an omnidirectional antenna allows it to maintain consistent performance regardless of the orientation of the receiving or transmitting device, ensuring optimal connectivity.

In contrast, a directional antenna is engineered to focus energy in a specific direction, enhancing the signal strength in that particular orientation while reducing it in others. Similarly, a bidirectional antenna typically focuses on two opposite directions rather than all-around coverage. A parabolic antenna uses a curved shape to concentrate signals in a specific direction, which significantly increases performance for long-distance communications but does not provide the omnidirectional characteristics. Therefore, the omnidirectional antenna is the correct choice for achieving an even distribution of wireless signals in every direction.