A wide-angle null-fill antenna with no null in the depression angle range, an omni antenna using the same, and radio communication equipment. The cable also includes an outer dielectric, and a shield conductor, where the outer dielectric is between the guard conductor and the shield conductor. The second compartment, which is inward of the solar heating block from the first compartment, contains a heat-absorbing material. The methods and apparatuses cause the inputoutput device to provide an audible warning and at least one electronic message warning based on movement, sound, and environmental conditions being outside acceptable tolerances.