A 1556 No.

A 1558

The LA is given in FREE D&DŽ V.3.5 ACCESSORY UPDATE: Monster Manual II on page 10. Download that update booklet here.

A 1559 Yes.
This effect gives you a natural reach of 20 feet.
While wielding a melee weapon (including one created by a spell effect), you threaten all squares you can reach with it.