I have not hunted in Kentucky so I can't say how it would work.
Generally, in mild ground a very sensitivity VLF will come close to a PI in sensitivity. So, there may not be any advantage to speak of. PI's work better in areas where the ground is bad and depth is lost when trying to use a VLF.
The TDI is being used in your part of the country for relic hunting, mainly CW sites with great success where the ground is bad. There has been quite a few posts regarding the TDI on other forums by relic hunters and the success they are having. Again, the worse the ground, the better the TDI shines.
Now, if you are a long time VLF user, the TDI will be quite uncomfortable at the onset. At least it has been for many people. PI's do not work like VLF's. A PI is temperamental, subject to external noise, are generally noisier than VLF's and don't discriminate anywhere as well as a VLF. In fact, the discrimination feature is primitive by many standards but it does work once a person fully understands how to use it.
Anyone who doesn't have the patience or time to put into learning how a PI works, should probably avoid getting one because it isn't the type of detector a person will learn in a week or two. People who have used PI's will adapt faster, but even then it could take time. A good example is a friend of mine who bought a GS 5 but was disappointed at first because he was also using a more expensive PI also. A year later, he was quite happy with the GS 5 because it would work where his other PI wouldn't and it had features not found on the other PI.
So, whenever possible, one should try one, then ask questions, then try again to see if it might be what you are looking for. For me, the TDI and GS 5 were the cats meow, but I had been operating a different PI prior, so I knew what to expect from a PI standpoint.
Reg
