5:5

Old radio codes are known as "Q Codes".

The first number represents the strength of the signal.

The second represents the intelligibility of the signal.

5 by 5 means the message is strong and readable, and is the best signal possible.

https://en.m.wikipedia.org/wiki/Signal_strength_and_readability_report

https://en.m.wikipedia.org/wiki/Q_code

>>1304353

That is as good a theory as any, anon. I thought "loud and clear" was too obvious, so I never mentioned it until now.