Not likely to accidentally turn on your controller . The dbsmods.com antenna will fit in most cases and backpacks with it on. It's a amazing how such a small compact antenna can produce incredible results . Great penetration through obstacles but important the peace of mind having such a reliable signal . Even if you don't plan on going very far away . I love flying out my back porch and I don't have to worry about aiming , I can just fly.
What backpack are you using? I wish it fit in my DJI hardshell.