Of course. As a matter of fact I once bought that very exact bowl for making a S band dish antenna. There's a small caveat: The bottom of the bowl is flattened

Of course. As a matter of fact I once bought that very exact bowl for making a S band dish antenna. There's a small caveat: The bottom of the bowl is flattened (so that it doesn't roll around). That's not a big deal though if you use a dipole feed; since the dipol radiates mostly normal to its axis (look up the pattern if it's unclear what I mean) a dipole mounted at the center and perpendicular to that flatted base will actually not "see" much of that flat base and work only against the curved part. Due to the rather small radius and being a spherical shape the directivity/gain is not that great, compared to a parabolic dish antenna. But it's cheap and works well enough if you have to cover only a couple of km. However keep in mind that regulations likely limit maximum transmission power to something like 20dB(m) EIRP, so depending on how much directivity gain you get, you'll have to reduce the TX power by that amount to stay legal… or get a license.