I guess I was under the impression that my BSE was worth something. I must have missed that lecture.
Those that can do. Those who can't teach or administrate.
I disconnected the emitter capacitors since they were apparently causing the amp to oscillate from the collector inductors.
I changed the input resistance to 1Ω (obviously not much signal will go through a 1G ohm resistor).
I did an AC analysis with an input of 1V, to give the small-signal (linearized) gain in dB.
Perhaps you're not aware of how radio works? - above 30MHz or so (so VHF upwards) the limiting factor is the noise level of the front end - which is why you fit masthead amplifiers actually on the aerial, effectively moving the front end as close to the aerial as possible.
Below 30MHz the limiting factor is atmospheric noise - so amplifying doesn't really help much, as you're just amplifying the noise as well as the signal. If the frontend of the radio is particularly poor (as an SDR radio might well be) a small TUNED amplifier could well help - and frontend tuning is always going to help an SDR radio, as often they don't have any.
There's no point for medium wave, as I've already explained the limiting factor is atmospheric noise.
I wouldn't have thought there's any point anyway, regardless of frequency, if you're only cooling to zero degrees - to improve noise at microwave frequencies requires seriously low temperatures, such as liquid helium.