It is quite intriguing that most virus capsids are either icosahedral or helical in structure. Presumably, these two structures were the ideal structures to protect a viral genome and accessory proteins within a virus particle.elical Capsid. Helical capsids are usually formed from one protein that interlocks to form a helix-like structure around the viral genome. They are usually more common among viruses that infect plants, though influenza, measles, mumps and rabies viruses all have helical capsid structures.
1 RF modulator converts AV to RF channel.  Consumes 9 VDC input voltage and offers Antenna interfaces/ports for reliable transmission.
Plug the modulator's electricity cord into a power outlet. Turn both the modulator and the stereo or TV on to check that you connected them properly [source: JASCO]. Connecting to another VHF Input Source Connecting your RF modulator to both a TV set and a VCR, DVD or cable box is easy.