Just got my new Fisher F 5 detector yesterday. What nice one that is. More than highly recommendable. There is some strange regulation written in the manual that i don't understand the purpose for though. 1. Antennas/coils with a higher gain than 3 dB is STRICTLY prohibited for use with this this device. 2. In the warranty is also written that "changes or mods to this device not expressly approved by the party responsible for compliance could void the users authority to operate this equipment".

Anybody knows why? Very interesting