T&L Publications

Then using CeaSar's analogy, if my example antenna exibited a gain within the range 9.97 dB and 10.03 dB consistently, it is said to be within the specified accuracy, or within specification . If it consistently measured 9.5 dB, then it is precise, but not accurate. We say it is out of specification .

Like most specifications, accuracy means nothing without a range . Antennas are spec'ed for gain in dB(d) against the gain of a perfect dipole at the same frequency. If you had a ham radio 2 meter antenna (144-148 MHz) and the gain was stated as 10dB(d) with 0.03% accuracy, then the gain could vary ...