Ya can you tell if the coyotes are Lancaster SEPA Coyotes or Luzerne county NEPA coyotes by their ethnic twang of their howls! You got your Amish Coyotes and you got your Polish Coyotes!
On two occasions one being on a hunt with Scott police sirens in the night caused coyotes to howl. The one time here in Cumberland county the police siren on a major highway near by caused a coyote to open up. I quickly went from my fox hunting sounds to my coyote scenario and called in the biggest coyote ever!
Train whistles, horns and bells ! Wow now do they get the coyotes howling!
You could tell after awhile if a coyote is a female or male by the pitch of the vocals! Low a older male and high a female! Yes use sirens to locate them big time!
In defense of if you can tell if it's the same coyote above.. If the food source is good the coyotes will hang around for quite a long time.. So you could actually get to hear them howl often..
By all means use sirens to locate them...Actually any loud noise will get them howling but I just can't see us predator hunter breaking the night silence with the air horns we use on our boats for safety.. the farmers household would get sick of hearing that constantly.
So many things we do post on here we need to ask ourselves is this theory or is it fact.. The siren thing IMO is fact. Read an article once that you should locate them in the morning hours with sirens and then sneak back in the sun up time frame and call them in with a rabbit distress.. There have been times when calling that two howls right at the beginning of the calling scenario called in two coyotes within 20 seconds of doing the howls.. This has happened for me twice now.. so nope don't ever use howling to try to locate coyotes..
Something too that coyotes will sometimes come in for food distress sounds when calling fox and other times will not even be bothered when your calling fox but they are there...The coyote is such a unpredictable critter that's for sure..