coyotes are smart and are prone to smarten up even more when hunted and not successfully shot
rabbit calls are the most commonly used, practice a fair amount before heading out (don't want to have the above happen)
start softly and then slowly build up (they may be closer than you think), no need to be super loud
you want to mindful of the wind (many use a cover scent to help) and try for a commanding view, they will often circle in behind you, pay close attention, but don't make sudden movements
if you see one (or more coming) a small squeaker (little rubber bulb affair) is very handy to direct them in- it's quiet and can be operated one handed (or even under a foot)- coyotes have amazing hearing (and even better noses!)
camouflage is helpful, in the winter a simple set of white coveralls works well
get your known ranges squared away ahead of time, try not to miss (see first sentence

)- if you do miss try and call again, occasionally you can get one to come in again (albeit rarely)
give it some time before giving up and moving on, I usually give it 30 minutes, sometimes a little longer
having said all that, someone who has some skills trapping coyotes (these are difficult animals to trap as well) will be more successfully in ridding you of your problem, but obviously there goes the fun factor!
