[Amps] HF Bias-T...sorta off topic

[Scott Townley]

I would like to make a bias-t (aka dc injector) for HF...3-30MHz.  It needs 
to handle c.2 amps and preferably around 500W RF.
The application is remote-tuning a "screwdriver" antenna.  Seems silly to 
run another 250' of DC wire...unless it makes more economic sense.
The tie-in...well I guess shunt-feeding an amp is essentially a broadband 
bias-T...I just don't need to block or withstand 5kV :-)
TIA,