Based on the essential theory of Penning gases,the discharge characteristics of He-Ar Penning gases in insulating tubes were analyzed qualitatively.The relation between the effective length of an antenna column filled with He-Ar Penning gases and the applied radio frequency (RF) power was investigated both theoretically and experimentally.The distribution of the plasma density along the antenna column in different conditions was studied.The receiving characteristics of local frequency modulated (FM) electromagnetic waves by the plasma antenna filled with He-Ar Penning gases were compared with those by an aluminum antenna with the same dimensions.Results show that it is feasible to take plasma antennas filled with He-Ar Penning gases as receiving antennas. Based on the essential theory of Penning gases, the discharge characteristics of He-Ar Penning gases in insulating tubes were analyzed qualitatively. The relation between the effective length of an antenna column filled with He-Ar Penning gases and the applied radio frequency (RF) power was taken both theoretically and experimentally. The distribution of the plasma density along the antenna column in different conditions was studied. receiving characteristics of local frequency modulated (FM) electromagnetic waves by the plasma antenna filled with He-Ar Penning gases were compared with those by an aluminum antenna with the same dimensions. Results show that it is feasible to take plasma antennas filled with He-Ar Penning gases as receiving antennas.