Quote Originally Posted by K8TAE View Post
Slave an R-70 to a 720A means what exactly? Thanks...73
The R-70 has better interference-fighting controls than the '720 does. With the EX-7072, you can control the '720's operating frequency by means of the R-70's tuning dial. It's like having two receivers in one.

Go here and read N3WXW's review of the setup:

http://www.eham.net/reviews/detail/2594?page=1


An eBay listing for one: https://www.ebay.com/itm/Icom-IC-707...-/192093772904