I once did a connection between this, on the top of the hill:

and a SenseCAP Card Tracker T1000-E, on the roof of the tall office building, 40km away, under the ideal conditions.
However, it wasn't until I've installed the proper RF filter and this monster of an antenna that the connection became reliable in the nearest city and even villages >50km away.
So you can absolutely start small, and if the need arises, upgrade later.