At 136 to 174 MHz, a walkie talkie will generally transmit and receive signals for around 40 miles. So if you are within range of another walkie talkier, you should be able to communicate without issue. However keep in mind that this is only an estimate - depending on environmental factors (e.g., weather conditions), there may be certain areas where the signal is weaker or blocked altogether. In order to prevent any possible disruptions in communication, it is always recommended to use caution when travelling with a walkie talkie.