First of all a Broadcast License would be something like what a radio station (AM/FM) or Television station would have. They transmit, you receive. Amateur Radio cannot be used for "business" and not sure if using it on a farm would count or not. A lot of weather spotters are indeed Amateur Radio operators, and that is often one of the primary modes of commutation. If you are wanting a radio for you farm work, CB or FRS (Family Radio Service), or go to the GMRS, however, GMRS does require a FCC License. If you are just wanting to have personal use (no business) than a Amateur License is okay. However, with this you need to take a test. There is a cost, however, the license is "free", and good for ten years.
I hope this answers your questions.