Posted: 12/07/2015 at 11:49
Very difficult to ' scare' pigeons, just ask farmers. I work at a site where they bring in a falconry firm to fly a harrier hawk once or twice a week. The pigeons fly off for an hour or two then return!
I would suggest netting but its not to everyone's taste, it works for me on the allotment, however in your garden it may look unsightly. If you do use netting make the frame and netting such that birds can't get trapped. Plenty of good info on the web. I use debris netting, available in various colours and cheap if bought on a roll.