High Tension is a Prepper Stash in Far Cry 5. Prepper Stashes are mini-quests that offer exceptional rewards for completing.
Location
This stash is located at the Lincoln Lookout Tower in Holland Valley. It is south and slightly west of Rae-Rae's Pumpkin Farm on the top of a hill.
Finding the Stash
This quest is all about ziplines. Follow the road to the tower and kill anything in the way. The stash note is on the side of the tower. Use the ziplines until you see a tree platform. Jump across and over some logs, then locate another zipline. The stash is at the end of this one.