Sorry to read this Brian but can understand where your coming from,I have lived with this problem since moving to the outskirts of Moffat in 1990,stated all those years ago to Doug Mc Clarey who i think has now moved to Australia that what was my problem would soon become everyone's problem how right i was,have tried all solutions believe me everything and only one thing works Got my yb team split cocks and hens so that they exercise properly and they are doing just that ,I know that each time they are in the sky and ranging that there odds of not encountering a peregrine strike lessens so i just put them up and get on with the loft work until they return if you stand and watch them being attacked all the time it defo gets to you,just tonight they the hens disappeared as they have been doing for an hour and racing the sky's but as i worked in the loft they hit the roof within 5min I new what the problem was straight away when i put them in a red hen was missing it has since turned up minus part of her wing,put the cocks out and they flew for an hour without attack,started this year with 26 yearling and old hens at present i have 5 left ,started with 19 cocks left with 4 yearling and 1 3yo who is going to ypres,No point in planning a pigeons future nowadays as it aint going to happen you either breed plenty if you live in area's like this and get on with it or pack in and walk away thats the options,Good Luck in whatever you decide Brian atb Mick