I generally hunt early morning, or evening until dark, but not in the dark. I'm afraid of upsetting nearby neighbors by shooting at night. Most would probably suspect I was poaching deer.
After quietly getting to my spots, and waiting a couple of minutes, I'll usually start off with 30-60 seconds of rabbit distress, in short screams, moderate to loud volume. Then wait a minute or two. Then repeat. Three or four times total. Then I'll usually switch to the lower volume whining call, similar sequence. I've had foxes come in at every stage of this process.
I bought a squeaker bulb this year, but haven't used it much yet. What kind of sequence would you recommend? Also, I read somewhere that a real rabbit distress will be the same volume, whether the fox is close or not, and it won't scare them off. I have to believe there's some truth to that.