Radio works but it depends on the business I guess. I heard many complaints about radio advertising. I advertised a special needs private school I started for my wife and that thing took off like a rocket in a couple of months only. We canceled the ad as she just wanted a school with no more than 20 kids and a helper. Still she has a long waiting list from the $300/month, ran 4 times a day ad. It's a business very much in need. Don't know how hot or in need your business is. Make sure to pound the business name 2-3 times in the ad.
Man, if you have a wife who is a teacher (obviously not well paid) who loves special education kids, push her to open her special education school business. The public schools treat these kids like shit and their parents are always pissed and suing them. She can charge whatever she wants. Here my wife charges $699 per kid per month, but some places charge several thousands. Depends on the city, town. These type of schools are unheard of. All you need is a building with a restroom. You don't even need a teaching license in most states. She doesn't have to accept every kid. She just need to be careful about what she says in the rejection. If she doesn't want kids that you have to change their diapers, you can say that you are alone and have no appropriate facilities for that which is true. That keeps you out of trouble for possible discrimination lawsuits. She can have kids which are slow learners only if she wants. Very profitable business if she likes kids. It will help fund your sorry ass projects too. LOL!