Good to gather these data openly! It gives a different view of the surroundings and it's cool to see the coverage holes. Suggestion: Add a yardstick to the UI and show all measurements at all zoom levels. And maybe indicate previous measurements as a user option? Is this app abandoned - the number of sent reports doesn't match the number on the leaderboard  and the map doesn't seem to be updated with new reports?
November 07 2016