Sure Peter, post 'em up.
Here's the P5 comparison: https://dl.dropboxusercontent.com/u/463425/IRT-RJ-P5.pdf
Here's the VK0H link: https://dl.dropboxusercontent.com/u/463425/IRT-RJ-Heard.pdf
Each is a 2-page document, with P1 being terrain profile and P2 being the actual HFTA comparison. Both are for 4 elements at 72' AGL on 15 metres.
As for Heard, you know that you're more than welcome to come over if you can't get them from your QTH. Or maybe I'll have the station remoted by then.
Thanks. I worked Kerguelen on a bunch of bands, when propagation was crappier, so I know I'll get through...you'll just have an easier time of it. We're both at 72' AGL. The charts show the base of your tower around 714-715' ASL; my tower base is 251' ASL. GPSs always suck at elevation calculations for some reason.
One thing I wish I had that F12 has is the tri feed. That I can never have with a SteppIR.
Yeah, I really regret cheaping out and not tri-feeding mine when I had the bucks to do it. Really would have made doing M/2 a cinch. I'm still really happy with how the XR plays, though. Wouldn't trade it for anything and if I had to do it over again the only thing I'd do is go higher and stack 'em if I could. They're frickin' DX laser beams.
I wish I had such flat terrain. Check out my terrain profile - on my QRZ.COM page . . .
But I had no problem working FT5XO on 80-17M and Crozet on 20M - and back when the SSN was 11. In fact, both were booming in here - worked FT5XO with short hatted vertical dipoles on the low bands and a 2 element yagi on 20 and 17M. 800 watts.
I also had no problem with VU7 on 40 SSB and CW and that was a very low point in the cycle too.
Amsterdam is closer, and probably a cross between Cocos Keeling (I have that 80 - 10M) and Kerguelin.
Heard Island will be tricky . . . . but doable. I have the HFTA plots for both sides of the island - and right smack in the middle is an 8000' mountain called "Big Ben".