In know it's not the 3 sports we've been discussing, but LWE cheerleading just might be the most dominant program at that school. If you're going back 5 years, I'd put Plainfield North in with that group and as mentioned previously Neuqua Valley.A few years ago this might have been easier because you had significantly more 3-sport guys. Now, its a rarity.
Lincoln Way East
Stevenson
Naperville Central
Mt Carmel
St Rita
Edwardsville
St. Charles North
Cary Grove
Huntley
Those are the ones I think of when you talk about the programs who of late have been most consistent in 3 sports. Each have their up and down years but in the past say 5 years those are the ones that deserve the praise as they have been consistent in a majority of sports.