Abstract: An electronic device includes a first antenna, a second antenna, and a device cover. The first antenna may be configured to transmit or receive signals at a first frequency, and the second antenna may be configured to transmit or receive signals at a second frequency. The device cover may be configured to enclose at least a portion of the device, the and may have a first thickness in a first area and a second thickness in a second area. The first area may be substantially aligned with a boresight of the first antenna, and the second area may be substantially aligned with a boresight of the second antenna. The first thickness may be different than the second thickness.