Computer hardware that incorporates software defined radios (SDRs) with software consisting of graphics processing unit (GPU) based digital signal processing for radio frequency (RF) survey, RF direction finding, and electronic warfare; Computer hardware for radio frequency surveillance, radio frequency direction finding, electronic surveillance, and electronic warfare; Computer hardware and recorded and/or downloadable software systems for radio frequency surveillance, radio frequency direction finding, electronic surveillance, and electronic warfare; Computer hardware and recorded and/or downloadable software for radio frequency surveying and monitoring, radio frequency direction finding, electronic surveillance, and electronic warfare; Downloadable software for radio frequency surveying and monitoring, radio frequency direction finding, electronic surveillance, and electronic warfare