Their OLDER 24" & 30" round will be OK with a DSS LNB attached for use on ONE satellite.
I've personally used the 24" and 30" with DBS LNB's and they work quite well.
The 60e & 75e *C elliptical dishes are optimized for the 4 degree spacing of their birds and adding the Bev "Y" Yoke is a royal PITA, I tried and didn't have much luck.
Remember the Bev 20" is designed for the 9 degree spacing.
The LNB discussion is correct,
Bev is DBS Circular and uses the 12.2 to 12.7 GHz range with a Local Oscillator of 11.250 GHz.
*C uses a FSS linear LNB and uses the 11.7 to 12.2 GHz range with a Local Oscillator of 10.750 GHz.
You can re-align it and use it for some of the other birds up their that have compatabile LNB's such as the linear Echostar birds at 105, 121 & 129.
If Bev won't cut you a deal on their dish, their is plenty of 3rd party FTA dishes that work well also.
The common 18"x24" with a tripple LNB holder is an alternate.
TIP: use the middle set of holes and not the centre + outside pair, it's easier to align and give better performance.
It emulates the Bev 20" and IMHO does a better job.
Out here they are $55 for the Dish and LNB's run $30 a pop.