Topband: Yaesu FTR-7700/FRA-7700

[Petr Ourednik]

Hello folks,

as I have chance to purchase used Yaesu FTR-7700 preselektor (ANT tuner)
0.15-30 MHz and Yaesu FRA-7700 active ANT 0,15-30 MHz I would like to
ask
You over here for opinion about the efficiency or better to say
usability 
for TB DXing or weak signal hunting on TB.

Is it useful on TB please?

I will be glad to have idea before emailing to the seller.

Thank You for kind help,

73 - Petr, OK1RP