Thanks for the research. Although, there is a listing of a Gnat being restored in the area, to me this particular aircraft doesn't appear as sleak as a Gnat: http://www.thunder-and-lightnings.co.uk/gnat/
I think he fuselage of the aircraft is too thin to be A-7. This becames noticeable when you take the original Google Map and enlarge it 200 or even 400 % of the original size. Then that blunt nose also starts look like an illusion. In enlargement the nose looks longer although it's really hard to be sure given the small original size of the picture. Still my money is not on A-7 although it might not be a Gnat either.
This one's perplexing. However, after running the image by someone who worked on the A-7 for Vaught back in the 70's, after agreeing it looked A-7-ish, took out a magnifying glass, and--like you indicated in an earlier posting--its long nose, sleek lines, and dual air intakes become evident.
Leading us to believe, it is, as you correctly guessed, a Gnat. Good eye!
Airplanes - Military - Parked - Fighters 
http://www.thunder-and-lightnings.co.uk/gnat/survivors.html
http://www.thunder-and-lightnings.co.uk/gnat/
But appears to have the blunt nose and features of an A-7:
http://images.google.com/imgres?imgurl=http://www.foxhound.terramail.pl/ch227.gif&imgrefurl=http://www.foxhound.terramail.pl/graf.htm&h=720&w=576&sz=8&tbnid=yaJ-V-ytaGswMM:&tbnh=139&tbnw=111&hl=en&start=18&prev=/images%3Fq%3Da-7%2BCorsair%26svnum%3D10%26hl%3Den%26lr%3D%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DN
I tend to be wrong 88.2% of the time, however.
Leading us to believe, it is, as you correctly guessed, a Gnat. Good eye!