six meter group.

The Six Metre band is located at the lower end of the VHF spectrum and exhibits all of the characteristics that you would expect of a VHF band. This is particularly true during the sunspot minima years when, for the most part, it is similar to two metres. The maximum useable frequency or MUF rarely reaches the ten metre band during this time never mind six metres and consequently the band is fairly quiet except for sporadic E during the summer and, to a lesser extent, the winter months.

The proximity of the six metre band to the HF Bands however is what makes the band totally different from it's higher frequency neighbours. During periods of high sunspot activity, the MUF can rise up to and beyond 50 MHz allowing some really spectacular propagation to take place.
Even when the MUF doesn't reach 50 MHz, solar activity can be the trigger that will allow various other types of propagation to occur. In fact six metres is probably the only band that will support just about every form of propagation that you can think of and this is just one of the many things that make it so interesting and, at times, unpredictable.