Don't shortchange 4-8kHz... an audible, high intensity piezo buzzer can be
heard for quite some distance :-)

"stan" wrote in message
...
hi, I'm still in process of designing some little tracking
transmitters (10-50mw) for model airplanes ( take my tech test on
Saturday!! ) and I'm trying to decide if to go the 400 or 800MHz band
approach. The higher frequency would allow a little shorter antenna
.. but would be a little more directional (?) ... considering what
I'm trying to locate may be out in the weeds somewhere does anyone
have any experience which one would be better and why ? TIA stan