Mobile Mark's EDX450 is rated at 250 watts and has 2.5d Bd gain, furthermore you can expect years of continuous service.
Available in either 1/4 wave or 1/2 wave configurations. The radiating elements and support arm are black anodized aluminum.
The EDX450 antennas are lightweight at less than 4 lbs. but are designed to easily withstand winds of over 100 MPH.