A basic straight 21ft "silver rod" base antenna with no groundplanes.
Made of tubular aluminium, supplied with U-bolts for mounting on a standard size pole.
We have found 5/8 wave antennas without large groundplanes do not swr as easily as a 1/2 wave, and my preference is to go for the 1/2 wave instead of this.
Made in the UK, these are sold under a variety of brand names and we will send whatever is currently in stock.