The ISIS CubeSat antenna system contains up to four tape antennas of up to 55 cm length, supporting a wide range of frequencies in both VHF and UHF bands. This system provides a CubeSat with the optimal transmission quality and system reliability for a minimum space. The top face of the antenna system can accommodate a two solar cell solar panel and it can be customized for accommodating sensors or other systems to protrude to the exterior, e.g. camera apertures. The antenna system is compatible with a range of standardized CubeSat structures. For custom made structures, which adhere to the CubeSat standard mechanical envelope, mounting is also possible.