[amsat-bb] J Beam for Saatellite Work

I again wish to inquire if there are any current or past satellite station users with experience using the J Beam, Model MBM88/70cm. It was manufactured by Jaybeam Ltd, Northampton England. Specifically, what SWR figures were noted and are there any procedures for optimizing SWR? Any information appreciated, please reply off line. Thanks. Farrell Winder, W8ZCF Cincinnati, Ohio, USA