There has been some discussion on this and other sites about unique antenna connections on certified Part 15 transmitters. Here is what the FCC actually says on this matter:
"The manufacturer may design the unit so that a broken antenna can be replaced by the user, but the use of a standard antenna jack or electrical connector is prohibited. This requirement does not apply to carrier current devices or to devices operated under the provisions of §15.211, §15.213, §15.217, §15.219, or §15.221."