no you dont have to buy the AH4
i used the LDG electronics RT11 tuner with my 706 for awhile and it
worked very well
good new is its cheaper than the AH4
good luck

Dustin wrote:
hello I was wondering what Antenna Tuners will work with the Icom IC-706
radio's or Do I have to purchase the Icome AH-4 Tuner. Thank you very much.