Maybe we could create a web of signals to nearby planets that constantly broadcast to each other,and see if any thing interupts the signal,or better yet we could attach a seti signal booster to a ion propulsion rocket and send it into deep space.Ion propulsion rockets are really cool they just keep going faster and faster.The ion propulsion rocket could constantly broasdcast as it travels,or broadcast a prerecorded Seti signal,(one of the good ones you guys found)Or a interesting experiment would be to put captured seti signals into a music recording of the subjects favorite band.we could then study the subject and see if the signals had any affect on him as he listened to his favorite CD with subliminal Seti signals .

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the voyager and mariner probes just left the solar system after 30 years of travel. Even with an ion propulsion engine it would take decades to make any significant distance on these probes.

These probes aren't all that distant celestially speaking. So a probe that would relay or magnify a signal would have to move greatly beyond the solar system and we'd still have to deal with the suns heliosphere and other cosmic radiation that is outside the solar system.

So long story short. Sending probes out beyond the solar system to boost signals would in all likelihood be of little benefit due to the actual distances to other stars.

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In a rich man's house there is no place to spit but his face.
Diogenes Of Sinope