Recorded using HF detektor wandering on the beach at Peenemuende in Northern Germany. Strong signals despite lack of potential signal sources close by. Stark contrasts between detektor signal when held close to the sand and when held high above the head
Compared to european BTS the japanese sound different. Must have some connection to different cellphone frequencies.
Long bus ride from Central Bus Station in Napoli to a bus station at the highway near Bisaccia. The ride is in a crowed bus with a lot of mobile gadgets. At 36:00 long after leaving the urban area of Napoli the BTS signals dissappear for the first time. Around 38:30 the detektor drives clearly audible past a mobile phone base station, most of them are near the highway! See pictures below. From there on the several BTS come and go and get less and less. Around 70:40 – 72:20 there more or less no high pitched base transceiver station (BTS) signal: A silent island amidst of rurality 2.0?
Walk from the Castle (there were many people due to the Festival “Interferenze”) down to the main square (piazza) and round the castle. Very clear GSM signals, because there is no background noise like in urban cities. You can hear clearly the BTS (e.f. 02:20 or 05:12 or ) some kilometers away, but via direct air line (see picture below). A UMTS signal (02:32), interesting signal at 06:25 (what is this?). There are also silent areas e.g. around 09:20, where you can hear the typical GSM localizing signal.