How to get HA?

So how does one get to HA? i always wanted to know, plus i want to play there :3.

Win 5 times in Team Arenas. They don't have to be consecutive.

yer, or I think 10 consec in RA

10 Consecutive does not unlock HA, only 5 wins in Team Arenas unlocks it.

I know this for a fact, because my friend had bought a new account so we synced into RA, got to 5 and unlocked TA, and went to 10 for the hell of it. We ended up having to score 5 victories in TA for him to unlock HA though.

Unlocking RA: win the "challenge" versus Zaishen NPCs on the Isle of the Nameless.
Unlocking TA: win 10 consecutive matches in RA.
Unlocking HA: win 5 matches (does not have to be consecutive) in TA.

No, it is 5 in RA.

What do you do there? I watch matches in observe mode and it seems like its not like ab where you fight a specific target.

Green, are you Demandred from my guild btw LOL? anyway you go to random arenas, and hit enter battle, and it puts u in a team and a map, and then another team join, and yall PVP PVPVPVPVPVPVP until one team wins, the wining team goes on to face another team, and the loosers cry and go back to town. I remember when i first won my 5 RA matches. Had my warrior tanking, a mesmer tat shot down their charracters, a ele that nuked the heck out of em, and a monk to keep us happy... God it was the happiest moment of my life....

*Veteran Member, Playing Guild Wars since December 23, 2006*

I'd also like to point out a lot of veteran GW players probably aren't familiar with how you have to unlock HA. You didn't used to have to unlock it, just just got it automatically. When they changed it, anyone with an older account was grandfathered in.
Thank god by the way, I never want to have to play TA.

You don't. You can get to the outpost by winning enough in team arena's (see previous posts) but then you'll only be confronted by groups who only take you when you are at least rank X.