The Blitzortung instructions will have you make a detector that picks up long-length, low-frequency radio waves that lightning generates. The lightning-radio frequencies are much lower than the frequencies used for the radio you listen to in your car; they range from 3 kHz to 30 kHz, when AM radio broadcasts at frequencies between 540 kHz to 1.6 MHz. These low-frequency waves are able to propagate for quite a distance, bouncing between the surface of the Earth and the Earth's ionosphere. So even if you don't live in an area with frequent lightning storms, your detector may still provide useable data to the project. A large antenna used in a location with little electromagnetic activity may detect lightning strikes as far as 3,000 kilometers (about 1,900 miles) away, according to the project instructions.