Anybody who can get a killstreak in black ops <---------------?

so im mobile and fairly aggressive but for some reason i find it sooo hard to get a killstreak even a UAV can be quite uncommon yet sometimes i get 7-8 maybe 9 killstreaks. so i bought a chopper gunner after much success with the (now suppressed) AUG. but for some reason i always get kiled!!!! nobody tell me to watch my back, lay low for a sec... i move around a bunch but i still do slap down the occasional motion sensor. anybody have tips to getting these killstreaks? also should i have ghost for my aug to make it a complete stealth cl (its supressed i think i said) and it may prevent me from getting killed alot and keep the element of suprisee. orr should i have hardline if i do i could maybe get 8 kills (i got a bunch of 7 streaks the last 9-10 or so games why not 8) so pleease give me tips i want to get a chopper by the end of vacation please a helpful answer will get easy points thanks if you answer :)