I'm joining this thread late and have not read all the previous posts but the Titan Dx is 25 ft tall and per GAP, it does not require guys. That said if the desire is the guy it, 3/8 size rope is way too large. >From CableXperts: 3/16 dacron rope is $98/1000ft. That's what I use to lightly guy my HF2V vertical. Phil -- Phil - KB9CRY Lockport, IL