An improved in-building radio frequency communications system with automatic failover recovery comprising a primary external antenna and at least one ancillary external antenna, each antenna directed to a primary transmission tower and to at least one ancillary transmission tower, respectively, and a diversity site donor system capable of monitoring the strength and/or quality of the radio frequency signals received from the primary transmission tower and switching communications between the primary transmission tower and the ancillary transmission tower(s) based on the strength and/or quality of the radio frequency signals received from the primary transmission tower.