other shortcomings of regenerative receivers are the sensitive and unstable tuning. these problems have the same cause: a regenerative receiver’s gain is greatest when it operates on the verge of oscillation, and in that condition, the circuit behaves chaotically. simple regenerative receivers electrically couple the antenna to the detector tuned circuit, resulting in the electrical characteristics of the antenna influencing the resonant frequency of the detector tuned circuit. any movement of the antenna or large objects near the antenna can change the tuning of the detector.