Is there a product that can trap speech at this range...at a consumer level price? Criminal neighbors are giving the local police fits w/o evidence. Thx

A parabolic microphone would pick up sound that far away. Do a web search for that phrase.

Make certain you understand the rules for audio recording of people in your area. They are different from video recording in many places and you could get in trouble recording conversations without the participants' knowledge.

Thx..I will learn local rules. Parabola might be a bit intrusive. Are shotgun mics of any value? Thx for info...

Are you in the US or outside the US?

At the very least you'd have to post signage. You won't be able to do a covert use of the mic at all if that's what you're planning. And even then at 70 ft there is a strong argument for a reasonable expectation of privacy.

And be aware that audio recording doesn't even begin to fall under the same rules/laws as video recording. The Federal guideline in the US is one party to the conversation must be aware they are being recorded. Some states and cities have more stringent rules.

Please note the following:

One party in this situation is defined as a person taking part in the conversation.

A property owner not present, does not count as a party.

The person who pays for the phone line does not count as a party if they are not actively part of the conversation.