55" should be your minimum size for viewing HD at this distance. A 65" would be better;
Viewing Distances Based on Visual Acuity
Maximum Viewing Distance for NTSC/PAL(720x480/720x576)
Maximum Viewing Distance for HDTV(Fully resolved 1080i; 1920 x 1080)
Something like this may suffice @ 3m;
I have recently moved into Carlingford area and now facing some horrendous reception issues. My tv is compulsive showing most of the channels on an irregular basis(never shows channel 11 and 10) or doesn't show anything at times. my antenna looks new and is installed very high on a pole. i dont understand what the issue is. any suggestions? should i get some installer to have a look? any honest ones out there that can be recommended?