This had me stumped for a minute too, but I have an answer. On page 34 of the manual, it notes that digital strength either offers a picture, or no picture. Of course, we know that there is intermittent picture as well, where a weak signal "freezes and pixelates". But for all intendd purposes, the signal strength meter on the television only measures analog signals. The digital signals aren't measured, and therefore, are greyed out.
The HD Antenna (and tuner) doesn't measure analog, but instead digital signals only.
I hope that helps answer the question.
Samsung Slim Fit: TX-S3082WH
I have an HD antenna hooked up to the Antenna 1 port. Fine Tune is active (this is for analog) but Signal Strength for digital isn't active. The manual explains what "Signal Strength" is for but now how to access it.
Anyone know how to fix this issue?