If I remember, from the one I was going to build, boom was 5'-1". But I got complications from trying to go boomless. Resulting in longer spreaders due to rolling offsets. Had it shooting for 50 ohm, no gamma, or 75 ohm matching coax. I got lazy and ordered one.I don't have it yet, but I imagine it's 5' ish. Picture is in his yard. I hope to have it within a few days.
For the price, you got a fine deal. Looking forward to seeing some better pictures.