The HBU Antenna Series has been designed specifically for RF channels 7-69. Over 95% of the broadcast stations in the USA now broadcast only in these RF channels, so there's no need to have an antenna with elements for channels 2-6 (and those are the ones that require the long elements at the back of the antenna). The result is a smaller, more streamlined antenna with less wind load and better stability. You can find out what your local RF channels are at www.antennaweb.org.
*RF is the real radio frequency that television stations broadcast on. These RF channels are used in selecting an antenna. The virtual .1 channel is the one you remember from the pre-digital transition, and is used to remember the "old" analog tv channel. To see your RF channels and virtual .1 channels, go to www.antennaweb.org and input your zip code.