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The MF and HF regions of the radio spectrum are most impacted by ionosphere charge and the solar sunspot cycle. The MF and HF regions of the radio spectrum are most impacted by ionosphere charge and the solar sunspot cycle. During periods of high sunspot cycles there is an increase in the skip distance of the skywave at night.Frequencies below 10 MHz travel most efficiently by skywave at night. Frequencies above 10 MHz travel better during the day. Part 95, Subpart D of the FCC rules. It is illegal to engage in, or attempt to engage in communications with any station more than 155.3 miles from your locationThere is no law against listening. Any CB radio owner may listen for DX (DX hunting) with their CB radio during periods of skip activity without breaking any regulation. CB operators attempting to communicate via skip shooting tend to use SSB (single side band) capable transceivers. If you are interest in listening you will need a receiver that is capable of tuning SSB. Most shortwave radios do only AM. Think of SSB as one side of AM less the carrier. Standard 40 channel CB radios are AM only at 4 watts legal transmit power. SSB capable CB radios can transmit up to 12 watts on SSB while still being capable of 4 watts on AM, using the upper or lower side band USB or LSB, legally.