Y1Ba2Cu30x films, screen printed grom submicron powders have demonstrated sensitivity to . lc radiation, with a responsivity of 103V/W. Based upon detailed calculations the response is consist.ent with a bolometer mode of operation. The response, to chopped radiation with lmw/cm input power, was determined as a function of temperature and dc bias current. Calculations were made on the use of antenna-like elements as detectors based on using their macroscopic properties. Modeling using lossy array elements predicted a marginal improvement compared to conventional flat plate design.