This antenna is from K0OV's book on transmitter hunting. It is well worth the cost and has become the bible for hunting those wabbits. Here is a PDF of this antenna project.Tuning for the frequency of interest is as easy as having someone a short distance away transmit. Rotate the antenna for max signal then adjust the cap to peak it. That's it. The trimmer cap can be bought on Ebay. Search "ceramic trimmer capacitor". I used a legth of RG-58 coax because I already had it handy and it was terminated with a BNC male. You might want to use RG-316 or RG-174 along with a SMA for connection to a newer HT. Anyway you want to build it, it works! Using it along with a step attenuator will greatly improve your ability to get a good bearing.