| Near real-time critical frequency, foF2 | http://www.convectiveweather.co.uk/ionosphere/ |
| ITURHFProp - Propagation Predictions | http://www.predtest.uk/ |
| United Kingdom - HF Band Conditions | http://www.bandconditions.com/ |
| Voacap | http://www.voacap.com/p2p/index.html |