Please be careful with external pre amplifiers. Remember, if it is directly connected to the input of the SA and the input of the pre-amp sees a signal of 0dbm, the spectrum analyzer sees +20dbm. Way outside its input specifications. The pre amp might survive a +10dbm signal in close proximity, but am not sure your SA will. Also remember, any signal lost because of attenuators before the amplifier are NOT recoverable. it is better only to use an external amplifier when the signals are very low and there are no other signals in the area. One way to protect the analyzer is to use a limiter between the pre-amplifier and the SA. Unfortunately, a good wide band limiter cost several times the price of a TinySA unless one finds one at an auction place.
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John
John Cunliffe W7ZQ