Today more experienced technician came to my house and they saw my picture quality and they said that you have to change ur dish antenna because dish antenna which u are using this is not for HD DVR,thats why you are recieving low picture quality.They told me that this antenna is for normal stb.They also told me that for HD dvr antenna size is 65 cm,for sd stb 60 cm.After changing the antenna still I am not geting good picture clarity as earlier.I have also Airtel HD+ in my home.Airtel picture quality is very fine if I compare to tata sky.But 2 weeks ago Airtel and tata sky picture quality is looking almost same,now there is a huge difference in picture quality between the two dth brands.Plese someone give me suggestion what I have to do to get good picture clarity.