powerdog,
The picture you posted doesn't look like any major brand. It looks like one of the cheap and low-quality (sorry

) "made in China" antennas. These antennas have no model number, and the model number has no meaning anyway, cause many manufacturers copy the same design, and produce the same antenna under different model numbers. Let me know if I am wrong , I'll be surprised if this antenna is manufactured in the US.
Now, regarding the elements length. It is a well known fact that Yagi antennas with gradually decreasing elements length achieve higher gain than the antennas with the same number of elements when all elements are equal. As a result, in commercial antennas, elements length is typically decreasing towards an antenna front. However, sometimes manufacturers prefer antenna designs having a minimal number of
different parts, as it simplifies the manufacturing process, packing, etc. This is especially true for cheap antennas made from low-quality materials. When a single element's cost is low it doesn't pay off to reduce the number of elements at the expense of making each element unique, even if the same gain can be achieved with less elements.
Equal length elements are usually a sign of low-quality materials. You won't see such antennas from the respected brands such as Winegard or Channelmaster ...
Hope this helps,
hdtvlabs