Exactly what I thought but there are 2 Antelope Valleys in CA one up North and one down South actually I believe the one up north is just Called Antelope.
Yes, as a Sacramento local with friends who live there I can confirm Antelope is really close to Roseville. I'm not 100% sure but it's probably attached to Roseville in some spots.
ETA: and the one near here is definitely not called Antelope Valley, just Antelope. I don't know where the roommie is from, but there is an Antelope not far from the college.