Then, as an expert on the subject, you should correct the Wikipedia entry on Chain Home which states: "Most stations were also able to measure the angle of elevation of the formation, which, together with the range, gave the height; local geography prevented some stations from measuring elevation." and "The receiving antennas were directional, so the signal strength received by each depended on the angle between it and the target. An operator would manually adjust a comparator device to find what angle to the target best matched the relative strengths of the two received signals. The angle of elevation to the target was estimated by similar comparison of the signal strengths from a second pair of receiving antennas closer to the ground, which produced a different sensitivity in elevation."

It might be of some use to some of the new guys reading this to explain how radar works. Simply stated: a radio signal is sent out along the beam which the radar operator looks at on his screen. When that signal hits a target, it is then reflected back to the antenna, there fore showing an object, in this case, an aircraft. I think that the Bell labs and RCA were the first to figure out the time from antenna to object and back, there fore they could compute the distance the object was from the antenna.
The IFF systems and transponder systems in use have this built into the system these days, so the radar operator knows the altitude of the aircraft he is looking at. Don't confuse that with the operators order to "squawk Ident", because that is for a different function, namely to positively ID the correct aircraft when several are around or in the same section of his or her responsibility. Most radar systems in use today, when the radar signal crosses a aircraft, the operator sees 2 small hash marks on his or her screen and when you Squawk Ident, the area between the two small hash marks fill in to make a small square. There is whole host of transponder frequencies in use and you would be told what frequency to tune your transponder to.
Here are just a few in use today and what they are for:
7500 Aircraft hijacking (ICAO, worldwide)
7501-7577 Reserved for use by Continental NORAD Region (CONR) (USA)
7600 Radio Failure (Lost Communications) (ICAO, worldwide)
7601-7607 Reserved for special use by FAA (USA)
7610-7676 External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
7615 Civil flights engaged in littoral surveillance (Australia)
7700 Emergency (ICAO, worldwide)
Hope this info fills in some blank spots for you!