2.4 ghz RF radio and antenna - nrf24 underneath a 7-segment display
These nrf24 modules use the 2.4 GHz ISM band. The wavelength of such a signal is around 12 cm. Antennas get useful when longer than one quarter of that so in this case 3 cm. That is in the order of the length of that meander. You adding wires to it actually makes the antenna perform worse !

At 2.5 GHz you cannot do much with standard wires. You could disconnect the meander on the module (there is probably a resistor or capacitor feeding the signal to the antenna) and use an antenna for Wifi instead. Note that these will have a small coax cable to feed the signal to the antenna. These are quite small and hard to solder properly. Some experience is required ! Then mount that Wifi antenna somewhere where it has some space around it. 

It is hard to predict what range you will get when mounting the module between other modules. Anything containing electrically conductive structures will harm the effectiveness of the antenna. It is always a good idea to give the antenna some space to "breathe".