Carfincraig

I picked my octavia vrs tdi hatch up last week driving down the road and was on anti slip part of road and got the feeling my back window had been opened vibrating droning feeling I checked all the ideas on this forum eg seats down parcel shelf ect to no avail I do not have spare wheel fitted so took out boot carpet and foam liner when hitting where tyre would sit I got the droning noise then put other hand over raised part where tyre screw would go and droning stopped got a spare wheel kit fitted it and wow no more droning what a difference hope this is useful info for you guys having same problem I had cheers