Firstly, forget the 1/8th wave antenna - it cannot work, it will be resonant at 80MHz.
To reduce antenna size, you add a loading coil either at the base or part way up the antenna, to make the overall item resonant at the appropriate frequency.
You can buy commercial ones:
G40DKF 1/4 (M5) Mobile spring loaded reduced 1/4 λ antenna whip especially made for use in connection with "G"-type mounts (bases) on vehicle roof etc. QUANTITY DISCOUNT PRICES
Mobile spring loaded reduced antenna whip made for use in connection with "G"-type mounts (bases) on vehicle roof.
Or make them yourself - here is a calculator to work out dimensions:
Build an effective, shortened vertical antenna by adding a loading coil. This online calculator tells you the amount of inductance your loading coil we need to have.
www.66pacific.com
Secondly, look at proper radio receiver designs - the collector loads should be parallel resonant tuned circuits, not just chokes.
Also you need a bandpass filter (tuned circuit) between the antenna and the first transistor, otherwise that can be overloaded by any signal at any frequency.
I've not clue what that jumble of bits in the middle of the diagram is supposed to be!
Add resistors or chokes in the positive power connection between low level and high level stages, with each stage having it's own decoupling caps.
You have something like that on the collectors - but the bases are still fed directly from the non-decoupled positive power, so can pick up stray signals.
This gives a reasonable example of the first stage, the "front end" of the receiver; it's actually a converter so ignore the IC and later parts - but the first stage & RF bandpass filtering, plus the power decoupling, are good examples of what you should be aiming for.