best op-amp for active biased dipole (electrometer instrumentation amplifier)?

[coppercone2]

So this is the associate or perhaps counterpart of a active mag loop, the active dipole


http://www.vlf.it/cr/differential_ant.htm

So I read this article first, and I figured out how to make a high quality version of the 30cmx1M dipole sides, by welding stainless steel sheet to make 'rings' that are stacked on top of each other to make large cylinders. The author found this to be the best way to get the parameters he wants. But then I thought that there might be a better device, so I came across this

https://datasheet.octopart.com/INA116UA-Texas-Instruments-datasheet-8441915.pdf

I thought to use this part with a mechanical chopper to occasionally short out the input to ground to keep DC level down. The bias current is really small, at 3fA, so the rate of voltage rise in an antenna is going to be slow. I think you can also AC-couple it using a array of wet tantalum capacitors.

Anyway, the author was under the impression that getting resistance > 100Megaohm is difficult, but that part seems to have.. knocked it out of the park (seems appropriate with what is happening on wall street with the stock 'suggestions' today).

So other then the problem of bias current build up, it seems to me that the equation the author is using for bandwidth suddenly has the size requirement decreased by quite a bit going from 100Meg to 1 Peta.

I am probobly missing stuff, but it seems simple enough to be worth a try. The noise is also smaller on the part I found.

What is your take on this?