Use the flexible antenna provided or an external antenna with a gain no higher than 3 dB to protect the sensitive front-end circuitry.
If you need a full digital copy of the manual, several online repositories host legacy Kenpro documents: Kenpro Kt 22 Manual
Rotate the Volume (VOL) control fully counter-clockwise before powering on. Set the Squelch (SQL) control fully counter-clockwise to "open" the squelch and check for background noise. Use the flexible antenna provided or an external