Not really. You may increase the signal strength of the signal target, but you'll also increase the unwanted signals and noise giving you false hits or intermod.
Intermodulation
Process where multiple signals mix together. This may occur naturally outside of the receiver or in the front-end of the receiver. Either way, it results in the generation of a "false" frequency. The resultant audio of this signal is usually a combination of the audio portions of each signal involved.
Sometimes only one of the original signals can be heard making it appear to be an image.
This typically occurs when the initial stages of the receiver are "overpowered" by very strong, local signals. Radios with superior designs have better filtering which are better at keeping multiple signals from entering thereby helping to eliminate intermodulation.
Usually referred to as simply 'intermod'.