The lower right may be in the fenced compound (roughly): ETRS-TM35FIN 391392E 6668304N
Checking against imagery... there is a tri-antenna structure just to the north of this compound, and what looks to be a blast resistant revettment to the east.
The location I initially thought fitted the lower left one looked less promising in imagery, but it is the "restricted" zone (of a type I couldn't translate) just to the south of Flakaholm south of Espoo. Miessaar Karlo. Might just have missed the features though. (Obviously used historically for coastal defence, as seen in the turrets/bunkers) There does appear to be a radio tower near the channel between the three islands MK,Flakaholm and Pukkisaari Stora Bokholm.
Directions and distance look 'about right' for these two, and there are some possible candidates for #3 within the BUA of Helsinki, near the E12 (south of the airport).
