CPAverify minimizes the need to check the website of each State Board of Accountancy individually to determine a CPA's license status. CPAverify, with support from participating State Boards of Accountancy, allows consumers the opportunity to check the status of multiple licenses a professional holds at one website.
Generally, if the airspace is not Class A, B, C, or D, and is controlled airspace, then it is Class E airspace. Class E airspace extends upward from either the surface or a designated altitude to the overlying or adjacent controlled airspace.
Most commercial equipment is UL listed to commercial equipment standards. The FCC class A rating means it isn't legal to sell it to a home consumer user. The class B means it can be sold to consumer or business users. The A standard is looser than the B standard. The standard covers a wide range of spectrum, not just AM radio or TV frequencies. In most cases, you won't have a problem. But you might, and it is more likely with FCC A equipment in a home.