The early system used an antenna known as a hogtrough.

Systems with high data rates may even use a directional antenna, if required.

This technology can use multiple antennas to target one or more sources to increase speed.

However, using a single antenna only gives a direction.

In most cities, subchannels must be received using an antenna.

Smaller systems may use a broadband antenna to share several channels.

In the late 1960s traffic radars began being produced which used a single antenna.

The system used a smart antenna to improve reception in fringe areas.

Phased array is a different technology for using multiple antennas.

Type 33 was still another 10-cm set; this one used separate round-horn antennas.