Let's say a binary asteroid system or an exoplanet orbiting. These objects emit gravitational waves in wavelengths we could detect, but they aren't powerful enough for any sensors invented. With EM radiation to detect faint signals you make the receiver larger, but with gravitational waves that just shifts the wavelength you're observing. In theory how can you stay at the same wavelength and increase the sensitivity? Could you put multiple observatories next to each other and combine their data?

edit: I mean that these objects like asteroids and planets could be detected very theoretically. The main point of my question is how to improve the accuracy of a detector or if it's even possible to. Could it ever be possible to detect weak signals like this? Gravitational waves seem like something you could theoretically use to gather information on almost any object in the universe but they're so weak and faint that they are almost never detectable