Utstar pcs1400 Betriebsanweisung

Use only the supplied or an approved replacement antenna.  Unauthorized
antennas, modifications, or attachments could impair call quality, damage the
phone, or result in violation of FCC regulations.  Please contact your local dealer
for replacement antenna.

Do not use the phone with a damaged antenna.  If a damaged antenna comes
into contact with the skin, a minor burn may result.  Please contact your local
dealer for replacement antenna.