The PSTN2-2200 halfwave device antenna offers 2.3 dBi gain in a semi-flexible radome. It requires no groundplane for operation. It can be used on small devices with little or no groundplane, or it can be used on products that consist of all plastic chassis or case. The PSTN Series antennas use a full length center fed dipole configuration. Radiated energy is most pronounced along the horizon, with maximum peak of 2.3 dBi, free space.