It's fairly typical for the S/L-band telemetry and command and control antenna (omnidirectional, in case of pointing/station keeping error) on a satellite to be

It's fairly typical for the S/L-band telemetry and command and control antenna (omnidirectional, in case of pointing/station keeping error) on a satellite to be a very low data rate, and narrow channel. The narrower the channel is, the easier it is to pick it out of noise, and aim medium sized earth station dishes at it.