Ground clutter was a major factor in WWII radar. Thus you see radar towers. This elevates the transmitter and receiver to a level where ground clutter reflections were minimized and lateral range was increased. Even with today's radar tech detection below 500 feet is very difficult and not reliable.
So, IMHO, the current setting of 50 feet is not realistic. I do not like the range of 25 miles, but it was available in WWII with the right terrain conditions. At sea, on a flat plain, or from a high cliff. Our bases, located in a valley, adjacent to rolling or mountain terrain would have blind spots at worse or degraded range.
The current settings are not realistic. They are a "game" thing. I do not like them. Nuff said.
I call BS.
I've posted examples of the 50 foot and below expectations flown by the guys who flew it for real in WW2.
"To avoid detection by German Radar, the planes tried to creep below the effective height of that equipment and this meant getting down to about 50 feet above the sea..."
RAAF Beaufighter pilot Raynor Barber
"We had a very specific way of approaching targets. We flew at sea-level to keep under radar and out of sight, as surprise was crucial. It was not advisable to turn around and look back at that stage as the sea would be swirling just behind the wing from the wash from the propellers. The propellers themselves were less then a foot off the water. This caused trouble if their was an inexperienced pilot on the mission. One would occasionally panic when he saw how low he was and automatically pull the aircraft up into the air. If this happened once, the Japanese radar would know we were coming. If it happened a couple of times they could pinpoint our intended target from our flight path and be ready and waiting. We lost too many aircraft that way. We got wiser as we got older and never allowed an inexperienced crew to go out on a job like that. We would be one aircraft short rather then take an inexperienced pilot."
Seems like both the Japanese and German radar looked low.