The Hustler web site says: "For optimal performance, radial wires should be used." Somewhere else, there is a recommendation for sets of 3 tuned radials per band on which you plan to operate.
A short metal pole in the ground does not act as a proper RF counterpose for HF bands, nor does it prevent ground losses, and will very likely not allow the best ...
The info is in the model number
BM - Bluewave Marathon
E - Exposed offset
F - Gain 5.5dBd
N1 - Connector Type
H - Horizontal Polarized
More info can be found here - Please note you may have to download the whole book for all info.