In large bowl, combine olive oil, tomato paste, vinegar, garlic, basil, and red pepper flakes. Stir until blended. Add shrimp and toss to coat. Cover and refrigerate for 1-2 hours, mixing occasionally.
Prepare grill according to manufacturer's instructions.
Remove shrimp from marinade and thread onto metal skewers. Place on grill rack and cook, turning several times, brushing with remaining marinade. Cook until done, 6-8 minutes. To insure complete cooking of marinade, allow at least two minutes of grill time after last application. 2 servings (Recipe can be easily doubled).
*Amore double-concentrate tomato paste is recommended