55′ is the best “Nominal” height for the UrbanBeam for 40 Meters
This time around, I will have a SteppIR UrbanBeam on top of the tower, also without a rotator – and I will rotate the antenna from the base manually. I have found that pointing the antenna in one direction – for weeks or even months – works like a champ. The standard kit (which I picked up yesterday), has 8 tubes – because I don’t use the “carrying cage” as the last extension tube, the height overall is 40′. I do have a 6′ double walled aluminum mast that I can attach to the top, so even if I could find 2 extension tubes, I could get the UrbanBeam up 55′ – which is a very good (lowest) height for a 40M horizontal antenna. The gain, takeoff angle and pattern aren’t that much better at 60′, so even if I can only find 2 AB-577 extension tubes – that would be fine.
On 20M, at 55′ the takeoff angle is quite low – 15 degrees
I looked at 30M and 20M and they both benefit quite a bit from the height going from 34-ish feet to 55-ish feet. So, that’s the plan. I will keep the ALM-31 because it should fit any neighborhood I move into when I retire – not sure about the AB-577, but I will avoid CC&R’s and HOA’s like the plague when I retire. My parents had the “HOA Police” on then about the cut of their lawn – which I thought was disgusting – HOA’s and CC&R’s can go shove it. I have none of that here – I made sure of that when I purchased my house.