Adding an external low noise amplifier (LNA) can improve receiver sensitivity by reducing its noise figure. However, this comes at the cost of reduced signal handling capability and dynamic range due to a lower third-order intercept point (IIP3). While an external LNA may increase sensitivity by a few dB, it also reduces the receiver's IIP3 by 15 dB, making it more susceptible to interference. Therefore, simply adding an LNA does not guarantee better performance, as the receiver may become unusable except in very clean RF environments.