Once heard it is easily identified. It sounds like frequent rushes of noise, like a rapid ocean surf, punctuated by a quivery subsecond structure. If correlated with transits of Jupiter's inner moon, Io, the data is useful and publishable. Above 600 mhz you may use phased arrays of antennas such as Yagis and helices. Read-out equipment includes a D.C. amplifier, strip chart recorder or a computer.
Audio monitoring is also useful to determine if the received noise is truly celestial.
Best results for this type of work will only be achieved in radio quiet locations. If your local environment is noisy, it is best to move the observatory to the country. Idle farm land can sometimes be leased quite inexpensively for this purpose. You may also be able to get land use in a remote county park for such activity with proper approach and proposal to your local county commissioners. Technical information freely circulated in our monthly journal helps amateurs to obtain good low noise equipment from off the shelf assemblies, or to build their own units.