One of the very important challenges in plasma antennas is the coupling of the RF signals to the plasma column. RF signal coupling significantly affects the antenna efficiency, antenna implementation cost, structure implementation complexity, antenna pattern shape, and final structure size, weight, and volume. In this article, firstly the various methods of coupling were introduced, described, and compared. Then the capacitive coupling, direct coupling, and sleeve coupling were presented, and their advantages and disadvantages were mentioned and compared. A plasma-folded monopole antenna with sleeve coupling was designed, simulated, fabricated, and measured as a sample of this RF coupling method. By comparing these different coupling methods, one can conclude that the sleeve coupling method is the most suitable. This method has the least sensitivity to change the dimensions of the antenna. It is also easy and cheap to implement. In this type of RF signal coupling method, the efficiency of the Nesta antenna is suitable and the coupling structure adds very small weight and volume to the antenna structure.