For outside use I suggest E-Field Antenna (easy to isolate) and an extra resistor as heater (100 ohm direct on coax terminals, only 0,2W??? ) - maybe resistor heater via extra wires ?
- PVC tube inside plastic foam tube
H-Field (loop/ferrit) can be placed inside, or outside in a thermobox - 5 volt heating resistor
http://vlf.stanford.edu/research/whistle...antarctica
http://wwlln.net/
/richo
- PVC tube inside plastic foam tube
H-Field (loop/ferrit) can be placed inside, or outside in a thermobox - 5 volt heating resistor
http://vlf.stanford.edu/research/whistle...antarctica
http://wwlln.net/
/richo