A domestic cat. The more and louder it howls, the better it works. I've used one in a wire cage on several occasions with great success. As usual, coyotes come in first but bobcats seem to come in nearly as fast plus be much less cautious.
Failing that, I use some liquid fish oil as an attractant. That stuff is pretty cheap at the drug store and it seems everything is attracted to it. I've had least weasels to bears show up to lick, roll, or just sniff where I've poured some on the ground. Other products may work better but one cannot beat the price of fish oil.
I hang a strip linen (wore out bedsheet) and dip the ends in Wayne Derrick's Rocky Mt. Cat Lure. Blows in the wind. About 5-6ft. up on a limb in the general area of the set. Derrick is out of New Mexico and I use it in Cen\Tx. I don't know that Eastern cats like the same lure.
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look for a dead skunk on the road. Pick it up and take it to an area where you think there might be bobcats. Put a bunch of trash over it. Wait until it snows. then start looking for tracks. If there are bobcat, coyote, or fox in the area they will be there.
I've not seen any carnivores that can resist the scent of the oil from a can of sardines. I eat the sardines and soak a cotton ball in the oil then hang it from a bush or a stake a few feet above ground.
When using it as bait for live traps I make trails leading into the trap by dragging it several feet in front of the door.
One shot, one kill........ It saves a lot of ammo!
Leatherwood creek top dog predator bait by Hoosier trapping supply
Leatherwood Creek Scents are very good and developed by the owner of Hoosier Trapper Supply, Charlie Mashcek. He and his son and son-in-law go to Arkansas every year specifically targeting bobcat. His lures has been thoroughly tested in the field. They are very nice people and more than happy to answer any questions you might have.
Bird wing on fishing line with a swivel about 2 1/2' or 3'above the ground, dig a hole down wind and throw whats left of the bird in it. we have a lot of collared doves hanging around our barns I shot a few with my pellet gun, put them in a plastic bag in the freezer I always have bait, once in awhile i get a coyote or a badger with this set. Rio7
The quick answer is Violator 7 for me. GH-II and gusto are time proven too. Equally important is the location and some visual attractor as some have mentioned. Set a trail around somethickets or briars, dry creek bed or rocky drainages. Cats hunt by sight and pretty much walk the path that can be traversed as quiet as possible. Good luck!!