Wightstorm Comms Relay Level 4 data signature spawning in HS volatile ice storms and hosting 1 canister that can be hacked (data) immediately. The 2nd can can only be hacked after depositing a Cryostatic Estimator  into Sansha's Stormfield Projector. More info on how to obtain those items can be found here Information on loot-runs for these sites can be found  EVE Journal .