I don't think every little private airstrip likely qualifies for this FAA rule, and that needs to be cleared up. And most all of these issues can be dealt with by issuing a NOTAM in the airport directory that "RC operations are likely in this (described) area". It should not neccessitate a phone call to the "tower" everytime you want to fly, and it should not require permission from the operator of the field. I know most of the places listed on the sectional are nothing more than grass strips, some of which are used for ultralight activities or occasion flying. The RCer need to be aware that if full scale planes are in the vicinity they should be on alert or even land if the need arises.