See this is true but also not. For my location east of the Spine, I need to look at the 2.5 degree scan for the beam to see over the Spine at 4,000ft. It samples the sky at 5,500ft over my place, despite being only like 23 miles away.
Looking at the 0.5 degree scan for Phin, that samples the air at actually a slightly lower elevation at like 5,300ft despite being 67 miles from the radar site.
Where I am and where Phin is, the radar hits us at the same height overhead despite massive differences in distance from the radar dome. Anything lower than that really gets blocked by the Spine here. BTV's lower scans are useless and only look up and down the Champlain Valley.
I'm not sure why it picks it up better here but there's also significant downwind drift of that fluffy snow. Like it often looks like it's not snowing over my house as the air, but I know if the radar is showing a wall of echoes that ends just east of the mountain crest, that will hit me. Wonder if the same thing is happening up there where Phin is getting downwind drift off those mountains to his NW. That's why I get a lot of stars are out looking east but it's snowing surprisingly steadily from the west, ha.