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High Temperature Superconductor (HTS) devices can and will improve the performance of ESM and shared aperture receiver systems. For the near term the most promising candidate for the reference Channelized Cued ESM receiver system is an HTS IF Delsy line that can provide 200 nanoseconds of delay across a 3 to 5 GHz band. Such a delay line can improve sensitivity by 1 to 2 dB while providing about a 6 dB improvement in two tone dynamic range. Perhaps even of greater importance is that the low device loss combined with the elimination of multiple amplifiers previously needed to overcome loss can significantly improve the amplitude and phase tracking of the delay lines. In future systems it is unlikely that a single HTS device will be employed. Rather, it is more likely that large portions of the RF architecture will be placed in a cooler as a means of achieving performance and cost advantages. This is thought to include an HTS front-end, conventional IF amplifier, and HTS IF receivers. Looking even further in the future it is likely that entire HTS receivers will be remotely located with their HTS antennas and only digits will be returned to central for processing.