RF Tower work is NOT the same as high rise construction or iron working. I would suspect that if the pay is as you claim, their work is very unsteady/minimal which would be the reason for the supposed rate. Furthermore, high rates are common with other areas of dangerous fabrication but they typically pay by the job, not the hour. Sure the hourly wage may SEEM high when you do the best case math (such as the claimed 1k/hr) but in fact since it's paid by the job, delays make your actual rate far more in line with normal pay rates.
Anyway, I have been at elevations exceeding 300ft. I can assure you, the rate was nowhere near the claimed 1k/hr, but it was in fact paid by the job. Some jobs get completed quickly, some not. Overall, it averages out to a typical pay rate and is not all it is cracked up to be.