Identifying strange amplifier types of amplifiers in a 1979 CB radio
D101 along with D105 do protect the receiver input from huge transient events, as OP surmises. They also limit amplitude of the transmitted signal going into the receiver. But D103,D104 are DC-biased with current from the RF GAIN control, to attenuate merely large input signals while receiving.

Common-emitter RF amplifier transistor Q101 has resonators (27 MHz) at both input (L101) and output (L102). C101 (33pf) resonates with L101 @ 27 MHz with fairly low-Q. A small-value neutralizing capacitor (C104) keeps this amplifier from oscillating. It compensates for collector-to-base capacitance inside the transistor.

L102 is a tuned circuit (27 MHz), part of a double-tuned resonator along with L108, top-coupled with a small coupling capacitor (C107, 3pf). This double-tuned resonator has a bandwidth wide enough to pass the whole CB band on to the down-converting mixer.
A noise blanker (NB) module (possibly an optional addition?) also takes its input from this double-tuned resonator.