Many CubeSats use an omnidirectional monopole or dipole antenna built with commercial measuring tape. Surface integrals over monopole and dipole sources remain. These antennas functioned as quarter-wave monopole antennas. Such antennas are known as printed monopole antennas. For many purposes only the monopole, dipole, and quadrupole terms are needed in calculations. A mast radiator is a form of monopole antenna. It functions as a quarter-wave monopole antenna. The SRR was excited by using a monopole antenna. A magnetic monopole would have a net "magnetic charge". The Hopf fibration is equivalent to the fiber bundle structure of the Dirac monopole. A "monopole" is an isolated magnetic charge, which has never been observed. This seemed very promising for solving the magnetic monopole problem. The magnetic monopole objection was raised in the late 1970s. A quarter-wave monopole, then, has an impedance of formula 29. Unlike the Dirac monopole, it has no singular Dirac string.