Interestingly enough,
Maplin (www.maplin.co.uk) use cheap enough gates that they detect large rolls of copper cable cable. So when I went to maplin to
buy a large roll of copper cable (20m of network
coax), the alarm does its thing.
Loudly.
I stand there looking perplexed, but maplin hires people that are actually knowledgeable with
electronics and
electrical engineering, so the clerk looks up from the counter, sniggers, and says that he was expecting it to happen, and I jumped higher than most people do...
It was fun going round the St. James Centre seeing how many gates I could set off.