A first amplifier is configured to provide a first variable gain. A selecting module is configured to (i) connect a first antenna to the first amplifier when a selection signal is in a first state, and (ii) connect a second antenna to the first amplifier when the selection signal is in a second state. A second amplifier is in communication with an output of the first amplifier and is configured to provide a second variable gain. An automatic gain control (AGC) module is configured to control each of the first and second variable gains. An antenna selection module is configured to selectively change the selection signal in response to the first variable gain or the second variable gain after a preamble of a data packet and before a payload of the data packet.