Sacred Heart Radio maintains studios and offices in Kirkland, while KBLE is broadcast from a transmitter site in southwest Seattle.

In part of the coverage area, primarily encompassing Seattle's northern suburbs, KBLE is broadcast on FM translator K262CX (100.3 MHz).

It was established in Kirkland but moved to Seattle in 1963, the same year it adopted its present call sign and daytime power of 5,000 watts.

[2] After the power increase, the station changed its call sign from KRKL to KNBX on December 1, 1954 (beginning to use them on the air on December 13); the renamed station's programming continued to consist of "quality music, weather reports and the broadcast of leading gospel programs".

[9] Broadcasting was also extended to nighttime at 440 watts on October 1, 1986, after a relaxation of rules governing clear-channel frequencies like 1050 kHz.

Ten hours a day of Sacred Heart's output is live, mixing local and EWTN programs.