The TA-53-M was designed to give the Ham who would like to have a 3 element beam on 5 bands, but who needs to keep the size of the antenna to minimum.
The design criteria was:
Mosley feels this has been accomplished only at the expense of front to back. They considered this to be the least area of importance considering only one director and one reflector spaced over a 14' boom working on five bands.
For the ham that wants a heavy duty all around performer the TA-53-M is for you. It will equal or exceed anyone's 3 element beam on a 14 foot boom in the areas of gain, band width, swr and construction.