The jammer you reference above won't work on most drones. Many (most?) consumer-type drones operate in the 2.4 GHz band, which is far above where that jammer operates. Instead, you'll want to grab one of the cheap Chinese jammers for the wifi band and use it. If you are based in the US beware that the US government is starting to crack down on RF jammers imported into the country and is even talking about going after consumers:
http://online.wsj.com/articles/fcc-levels-record-fine-against-chinese-maker-of-cellphone-jammers-1403205812Still, the legal risks are probably much lower than the risk of firing a gun at one of these unless you live in a rural area where discharge of firearms is not prohibited.