This appears to be a log entry from a ham radio operator, likely a CW (Continuous Wave) operator. Here's a breakdown of the information:

* "06:35" is the time of the contact.

* "JJ1NFN/1" is the call sign of the station being contacted, with "/1" indicating it's operating as an amateur station with one antenna.

* "on JP-1156(Saitama Stadium 2002 Prefectural Park, JP-ST)" indicates the location of the station being contacted, which is in Saitama Prefecture, Japan (JP). The specific location is likely a park or stadium that contains a amateur radio transmitter site with a identifier "JP-1156".

* "7006" refers to the CW frequency being used for the contact.

* "[JJ1NFN]" is the call sign of the operator making the log entry.

In essence, this entry indicates that the operator made contact with JJ1NFN/1 on 7.006 MHz CW at 06:35 UTC, and they are documenting the contact in their logbook.