cheap general purpose field detection probes (spectrum analyzer/oscope add ons)

[sarepairman2]

is there any kind of probes I am missing?

I intend to make hardline loop probes. I made a magnetic toroid based one, the two jim williams ones (slotted and figure 8 coil "highly discriminative" one, a 1 inch square loop probe, and a low Z (2 parallel with 50 ohm) 6 foot "esd" detector antenna.

I am planning on making the coaxial hardline based probes.

http://koti.kapsi.fi/jahonen/Electronics/Stuff/EMI_Sniffer_EDNMAG.pdf - jim williams one
http://emcesd.com/tt070100.htm - esd detector one
http://emcesd.com/tt080699.htm -square loop
http://www.interferencetechnology.com/wp-content/uploads/2012/04/Wyatt_NA_DDG12.pdf - current probe

I have a proper tektronix clip on current probe, so I don't wanna make one of those. the one using 0.05mm wire in the figure 8 was kinda annoying to figure out how to make, I ended up using two drill bits and a 0.00something mm shim in a vice to make it..

Other then the loop probes that are made using hardline, is there anything else that is useful?

Are there like microwave horns or such that can be made of copper sheet/etc? I have a 22GHz spectrum analyzer and is quite fun to build these not really calibrated "diagnostic" tools. I am looking for stuff thats useful in a fairly wide band, I don't want to make "tuned" antennas until I have a good use for them.