nRF24L01+PA+LNA not working with Uno and Mega

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I've tested the code a few more times and it seems to be working slightly. I've seen a few more "Hello World" messages appear on my receiver serial monitor, although they were few and far between. From what I can tell, the modules can only communicate (for a very brief moment) immediately after I disconnect the battery from the transmitter.

I haven't made any major changes to the code; instead, I only changed the baud rate and removed a few unnecessary lines before testing.

Transmitter code:

#include <printf.h>
#include <RF24.h>

RF24 radio(9, 10);
const byte address[6] = "00001";

void setup() {
  Serial.begin(115200);
  printf_begin();
  radio.begin();
  radio.openWritingPipe(address);
  radio.setPALevel(RF24_PA_MIN);
  radio.stopListening();
  radio.printDetails();
}

void loop() {
  const char text[] = "Hello World";
  radio.write(&text, sizeof(text));
}

Receiver code:

#include <printf.h>
#include <RF24.h>

RF24 radio(49, 53);
const byte address[6] = "00001";

void setup() {
  Serial.begin(115200);
  printf_begin();
  radio.begin();
  radio.openReadingPipe(0, address);
  radio.setPALevel(RF24_PA_MIN);
  radio.startListening();
  radio.printDetails();
}

void loop() {
  if (radio.available()) {
    char text[32] = "";
    radio.read(&text, sizeof(text));
    Serial.println(text);
  }
}