As a matter of practical experience, at ten miles line-of-sight, you'll likely need an elevated antenna. Fifteen feet up will be all the diference in the world. The Radio Shack can sell you the antenna and mast, as well.
FWIW, when I lived out there, my office was in Tustin- almost exactly three miles from the threshold of 19R- and I'd hear the tower (some really good controllers there) quite clearly.
But, at home in Fullerton, no chance of hearing SNA; but Fullerton (119.1, IIRC) was claer at about 4.5 miles from my house.
Now, in Dallas, I am about 15 miles from DFW, and most of the time, I can hear DFW tower reasonably well, but just over the noise threshold, so squelch is nearly useless.
SNA's a great airport to listen to, lots of traffic for the size field, and somewhat restricted procedures. Good luck.
...three miles from BRONS, clear for the ILS one five approach...