The high frequency of words such as "confident", "delighted" and "pleased" in Queen Elizabeth's speech could be seen as an indicator that she is in a rather optimistic frame of mind, according to Ben Medlock.
And in healthcare, hospitals are adjusting emergency room staffing levels based on the frequency and proximity of key words in search engines (e.g. flu symptoms).
With HackRF in the hands of hackers or security researchers, in other words, no wireless signal would remain secure just by virtue of using a unique, unfamiliar frequency.