The Unprobe-able Ishtar

This ship cannot be scanned down with probes.  Apparantly when the ratio of the ships signature radius to it's sensor strength drops below 1.08ish, it becomes impossible to find with probes even with implants, max skills and the best equipment in the game. Quick research later and it becomes clear that not many fit the bill, the most quoted being the Tengu, the Caldari tech 3 cruiser. But also on the list is the Ishtar:

On non-tech 3 ships not much can be done to reduce signature radius (warfare link that reduces signature appears to be it), but the sensor strength can be increased with ECCM modules (mid slots) and backup arrays (low slot). 

Difficulty with the Ishtar is it's offensive drones can be probed making it silly to make the main ship unprobe-able. Anyhow, here is the fit atm:

 [Ishtar, Unprobable]
Medium Armor Repairer II
Magnetometric Backup Array II
Armor Thermic Hardener II
Energized Adaptive Nano Membrane II
Damage Control II

Conjunctive Magnetometric ECCM Scanning Array I
Conjunctive Magnetometric ECCM Scanning Array I
Conjunctive Magnetometric ECCM Scanning Array I
10MN Afterburner II
Codebreaker II

Salvager II
Small Tractor Beam I
200mm Prototype I Gauss Gun, Antimatter Charge M
200mm Prototype I Gauss Gun, Antimatter Charge M
200mm Prototype I Gauss Gun, Antimatter Charge M

Capacitor Control Circuit I
Capacitor Control Circuit I


Hammerhead II x5
Vespa EC-600 x5
Warrior II x5
Ogre II x3
Hammerhead II x5