Where i downwind there is no coastguard and likely nobody monitoring the vhf radio who could be of any help. I carry hx40 to talk to my paddling partners in case we get separated. I have no illusions that it would summon a rescue party if i needed one. For that reason i have not gone to a bigger DSC capable vhf. There is nobody to pick up the vhf based DSC signal and act on it. Also from what i have read vhf transmission is line of sight plus a little help from refraction. But basically the distance you can transmit around the curve of the earth is highly dependent on the height of the two VHf antennas. If one of those antennas is being held 4” above the water by a guy floating in his pfd, i think transmission distance is extremely limited. You would probably have better luck if you are in a place where there is a coast guard vhf antenna mounted high above the coast on a mast or cliff. I have chosen to use a PLB instead. You have to keep the antenna above the water but the signal gets picked up by a satellite from anywhere on earth. Most PLBs have an infrared strobe built in as well. So my emergency devices are the smallest vhf i can carry (hx40), plb, and cell phone. Takes some practice to remount with all of that in the front of a pfd. Its a lot to carry but if things went wrong miles off shore in cold water it would be the only chance I had.
Current Skis: Nelo Vanquish AIR, Epic V10g4, NK 670 double, NK exrcize, Carbonology Feather, Think Jet, Knysna Sonic X
Former Skis: Epic v10g3, Kai Waa Vega, Epic V12 g2, Epic V12 g1, Epic v10 double, Nelo 550 g2, Fenn Elite S, Custom Kayaks Synergy