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A WebSDR is a Software-Defined Radio receiver connected to the internet, allowing many listeners to listen and tune it simultaneously. SDR technology makes it possible that all listeners tune independently, and thus listen to different signals; this is in contrast to the many classical receivers that are already available via the internet. ==personal usefulness==For local hams sometimes listening from a remote receive is useful, especially when the band is long.* http://k3fef.com:8901/ - Pennsylvania could hear other net stations best 11/19 evening but not hearing myself* GOOD: http://k3fef.com:8901/ - [B+] Pennsylvania: could hear other net stations best 11/19 evening but not hearing myself** GOOD: http://w7rna.dyndns-remote.com:18901/ - [C+] Arizona: hear other net stations and myself* GOOD: http://n4dkd.asuscomm.com:8901/ - [B] Alabama: use LSB-nrw, hears net stations good but lots of near station qrm* GOOD: http://w5cqu.homeip.net:8100/ - [B+] Texas: use LSB-nrw, hear net stations good and myself. <small>* CRAP: Lumpkin County School's SDR - Dahlonega, GA http://websdr.lumpkin.k12.ga.us:8888/* CRAP: Great Lakes Listening Post. Michigan USA - RTLSDR 80M 40M 30M 20M http://blerp2.dyndns.org:8901/* CRAP: VE1BAS / VE1BWV AFEDRI SDR and RTL Dongles -Oromocto New Brunswick Canada http://radman.no-ip.ca:8903/* MEGACRAP: Live Hams - KD8QED Winchester, Ohio... 80m Softrock Receiver. http://livehams.com/</small>