Very slow wireless on my Vero

I decided to install iperf on the Vero and run some brief tests. I didn’t tweak any parameters. The MacMini hosting the media files is the client, the Vero the server. The first and last results are with the Vero sitting upright. The middle two results are with the Vero on its side:

Client connecting to 192.168.0.180, TCP port 5001
TCP window size:  129 KByte (default)
------------------------------------------------------------
[  4] local 192.168.0.75 port 62499 connected with 192.168.0.180 port 5001
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.1 sec  11.9 MBytes  9.90 Mbits/sec
Bleach:~ mnewman$ iperf -c 192.168.0.180
------------------------------------------------------------
Client connecting to 192.168.0.180, TCP port 5001
TCP window size:  129 KByte (default)
------------------------------------------------------------
[  4] local 192.168.0.75 port 62509 connected with 192.168.0.180 port 5001
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.0 sec  21.8 MBytes  18.2 Mbits/sec
Bleach:~ mnewman$ iperf -c 192.168.0.180
------------------------------------------------------------
Client connecting to 192.168.0.180, TCP port 5001
TCP window size:  129 KByte (default)
------------------------------------------------------------
[  4] local 192.168.0.75 port 62513 connected with 192.168.0.180 port 5001
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.0 sec  17.4 MBytes  14.5 Mbits/sec
Bleach:~ mnewman$ iperf -c 192.168.0.180
------------------------------------------------------------
Client connecting to 192.168.0.180, TCP port 5001
TCP window size:  129 KByte (default)
------------------------------------------------------------
[  4] local 192.168.0.75 port 62560 connected with 192.168.0.180 port 5001
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-17.4 sec  12.0 MBytes  5.79 Mbits/sec

Doesn’t that seem very, very slow?

I was going to install iperf on the Pi, but I can’t figure out how to do that:

osmc@osmc:~$ sudo apt-get install iperf
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package iperf

and

osmc@osmc:/etc/apt$ cat sources.list
deb http://mirrordirector.raspbian.org/raspbian jessie main contrib non-free
deb http://apt.osmc.tv jessie main

I’m not smart enough to know what’s wrong….