So I'm assuming the Shaltari Mothership picks up a spike when it launches dropships, but the voidgates do not as they are just conduits and aren't actually launching anything? This is bad as it makes the Mothership a lot more visible!
40K - Dark Angels, Dark Eldar, Necrons; Lord of the Rings - lots; Bloodbowl - Dwarves, Wood Elves; SAGA - Anglo Danes & Welsh; Guildball - Morticians, Engineers; Dropzone/fleet - Shaltari