At the moment the base and collector are at the same DC potential which is not good in any amplifier. The configuration is common base which is good from an RF point of view but by the time the resistor values have been dropped and extra bias resistors added, any advantage it might have would be lost anyway.
Some experimentation is needed but my first guess at a solution would be to change the 3K3 resistor to say 270 Ohms and connect the antenna through the capacitor directly to the emitter. In the base, wire a resistor of 3K3 to ground and bypass it with a ceramic 10nF capacitor. Then wire the potentiometer as a variable resistor between the base and +1.5V line. In other words, alter the bias current to control the gain. It should allow you to set the current from zero to about 4mA, if necessary, add a resistor in series with the variable to prevent the bias being completely removed.
Brian.