This is not unique (but I've not had any luck so far myself)!
Incidentally, the city of St Albans, mentioned in the article below, was a very important settlement in Roman times so I find it amazing that there isn't a square inch of ground nearby that hasn't been 'sweeped' already more than once!
I found Roman coins worth £100,000 [$150,000] ... 20 minutes after buying first metal detector: Novice unearths 'nationally significant' find during first treasure hunt.Daily Mail 5th June 2013