IIRC most common COTS drones like a DJI operate on the same ISM band as wifi - so near 2.4 and 5 GHz. Unfortunately the Kraken can’t go past 1766 MHz, or 1.7 GHz. If you want to DF a drone, you’ll probably have to use a WiFi yagi and something like an Ettus B200 or an ADALM Pluto to get your LOBs.
As for GPS, in theory you could as GPS operates under that 1766 MHz limit. I personally have never used it for this purpose, and you’d have to get five identical SMA GPS antennas.
In terms of cell phone/radio handset jammers then as long as its under that 1766 MHz limit then you could probably DF those emitters. So a jammer jamming the 850 band of GSM could be detectable, but probably not the 1800 band. Just know that any man-packable solution may have an antenna array either too big and unwieldy to transport, or too small to be highly accurate, requiring more LOBs and thus more movement.
That being said IIRC the Kraken doesn’t demodulate a signal, just finds where it’s coming from so I don’t believe modulation will be an issue. May be wrong though.