O-p-e-r-a-t-i-o-n: Your ready to run, you have the rig on. The loop is up in the air, it's in the clear as much as possible. Where are the signals? Make sure your in the resonant bandwith of the loop. Check out the SWR...clear your voice, and get ready to QSO. But keep some things in mind: 

A. Your coaxial cap cannot take more than 100 watts at SSB, and I wouldn't run more than 30 watts of FM or CW. Some say if you put RTV on the end of the coax and cover the center conductor and the braid you can run over 100 watts (maybe 200). However, if you exceed the coax's power limit, don't be surprised if you find the SWR go outta wack and the coax catching on fire. 

If you want to run power, then we'll need to look into a nice vacuum variable capacitor, or cermamic variable. But that will cost ya.

B. No antenna tuners...don't even think about it. The magnetic loop is a high-Q tuned curcuit, which means that it will not operate at all outside of its narrow bandwith. So if you can't get at least 2.1 when you tune your coaxial stub, retune! 

C. Remember, the Magnetic Loop has a pattern when mounted vertically, this means there is a null in respect to the perpendicular plane of the loop. So if a station is weak, turn the loop and see if you can get the station into the pattern. Play with this and you'll see that you can also use the loop's null to get rid of bothersome interference.