What we do in France for attract hogs is ,put some tar on trees( from the bottom to 3 foots hight)(you can find tar in the horses shop)usually on each place use 2 trees but not too close than the place where you feed(around 50 or 100 feets)because this take away doe for few times.For feeding hogs I use corn with some truffe extract on,this is work very well,put the corn directly on land,use 4 pounds of corn,but the most important maybe is the water,choise a place where you can find water,if in you place you dont have water,make a hole,put a stong plastic sheet on the bottom and add water,this keep hogs near this place.Remenber you, that the day where you whant hunting hogs,try to not walk to much on the place,hogs have a very poor view but have a very very good sence of smell.
Regards