Hi Dave I use a Faraday pouch. They are relatively cheap to buy. You can get different colours so if you have two vehicles they don’t get mixed up. I also use a locking steering wheel cover on occasion. I have seen krooklocks removed by cutting through steering wheel with bolt cutters and bending it. Determined car thieves are hard to beat. But every level of extra security you have. Locked gates, locking bollards etc. Takes time to be beaten. If you make it a battle . They will probably move on to softer target.