Radio observation in hydrogen line (1420MHz)

I have a TV1 miniCASTER vehicle-mounted satellite uplink positioner system. It is designed to go on top of a minivan, has azimuth bearing around 50cm in diameter, and an altitude motor which attaches to an arm which holds the dish and can fold down automatically for storage when not in use. Would this suit my intended purpose to use it to point at and track masers?

Your description matches the TV1 miniCASTER vehicle-mounted satellite uplink positioner much more closely than a conventional antenna rotator. From the material I found, the system was mounted on broadcast vans…

The gain of a hydrogen horn or dish depends on its aperture which makes sense as bigger aperture means more light collected. But how does this work with a Yagi antenna tuned to hydrogen?

A Yagi works by a different mechanism from a dish or horn, but the same underlying principle still applies: For any antenna, gain and effective aperture are linked by: where:…