Model WMC-0.5-2-20dB-S from Werbel Microwave is a directional coupler that covers 500 MHz to 2 GHz with broadband flat coupling response, high directivity, and excellent return loss performance.  Very low insertion loss of 0.25dB typical, and higher power handling than equivalent core-and-wire designs.  Mainline and coupled port VSWR is 1.15:1 typical, making for high measurement accuracy with minimal reflections.  This device is 3.6 inches long and has stainless steel SMA connectors.  This model is RoHS compliant, however lead solder is available on special order.  Covers L-band and UHF.  Assembled and tested in USA.