The National Institute of Standards and Technology (NIST) is issuing a combined notice of intent to sole source and sources sought notice for the procurement of three Phased Array Antenna Receive Modules intended for RF channel propagation measurements. The specific requirements include a 256 element phased array configuration, dual polarization, a center frequency of 15 GHz, and compatibility with MATLAB software, with Extreme Waves, Inc. identified as the sole vendor capable of fulfilling these specifications. This procurement is crucial for advancing NIST's capabilities in RF measurements, and interested parties are encouraged to submit their company information and capabilities by January 23, 2025, to the designated contacts, Forest Crumpler and Jenna Bortner, via email.